Seattle Mariners

TRACK RECORD: Williamson spent one season at Texas Christian after transferring from North Iowa Area JC. Despite corrective surgery on both hips, he performed well enough to be drafted by the Mariners in the second round. He pitched minimally in his first pro season and spent 2020 at the Mariners' alternate training site.

SCOUTING REPORT: Williamson works with a powerful fastball-curveball combination that misses bats. His heater sits at 95-97 mph and generates plenty of swings and misses because of its electric life. Williamson's plus curveball has good 11-to-5 shape and a high spin rate that makes it another swingand-miss pitch. He tried to be too much of a finesse pitcher during the summer, using his above-average changeup and average slider instead of pitching to his strengths with his fastball and curveball. He delivers his pitches from a deceptive three-quarters delivery that features a high front side. He has average control.

THE FUTURE: Williamson will get his first crack at full-season ball in 2021. He has a chance to become a mid-to-back-of-the-rotation-starter.

TRACK RECORD: Stoudt was selected by the Mariners in the third round in 2019 and had Tommy John surgery shortly after he was drafted. His first game action came at 2020 instructional league, where he struck out 10 batters and walked three over nine innings.

SCOUTING REPORT: Stoudt thrives with above-average control and command of four pitches. His fastball sat 93-94 mph and touched as high as 97 during instructs. He moves his fastball around the zone effectively with a good downhill plane. Stoudt's best secondary pitch is a split-changeup that has earned future plus-plus grades from observers. Thrown with a vulcan grip, it's a pitch he uses to get swings-and-misses from both righthanded and lefthanded batters. Stoudt has scrapped his curveball in favor of a sweepier slider with roughly 15 inches of horizontal break. His delivery has some effort but his arm action is fluid.

THE FUTURE: Stoudt will make his pro debut in 2021. He likely projects toward the back of a rotation, but his performance in the fall added a bit more ceiling.

TRACK RECORD: From an early age, Aguilar stood out as one of the best pure hitters in the 2020 class. Aguilar trained with Rudy Santin, whose program also produced Red Sox third baseman Rafael Devers and Rays shortstop Wander Franco, and Aguilar is another advanced hitter with a sweet lefthanded stroke.

SCOUTING REPORT: Aguilar has a fluid, compact swing with a tight turn and clean path, getting the barrel on plane early and staying through the hitting zone for a long time. He stays calm and balanced, staying through the ball well to hit to all fields with good game performance. He has plenty of bat speed too, driving balls out of the park now with the projection for future plus power, though he's still a hit-first player who happens to also have power. There's a lot to like with Aguilar in the batter's box, with a chance for a middle-of-the-order hitter, though his defensive future is murkier. He spent time as an amateur training at shortstop, but he's built like Devers and has already moved to third base. The dedication he's had over the past year to shed excess weight shows in his improved conditioning, something he's always going to have to monitor.

THE FUTURE: Like Devers was at this age, Aguilar has a chance to stay at third base if his footwork and range improve, though there's some risk he could end up at first base.

TRACK RECORD: If Levi Stoudt was the biggest surprise of instructional league, Macko at least deserves the consolation prize. After making his pro debut in the Rookie-level Arizona League in 2019, Macko, who was raised in Canada but born in Slovakia, reported to instructs after working out at home during the summer.

SCOUTING REPORT: Macko stands out for his pitchability, athleticism and above-average command of four pitches. He took a big step forward in 2020, and while he doesn't have any bat-missing pitches, he has the finesse to get batters out. Macko's fastball ranges from 88-94 mph, sitting 90 mph, with late armside tail. The Mariners see his curveball as a potentially plus pitch and his slider has progressed to average after he changed his grip. Macko rounds out his arsenal with a fringy changeup with fade and good separation from his fastball. He's a studious worker who keeps a journal about what he's learned.

THE FUTURE: Macko should begin at low Class A in 2021. His feel and pitchability from the left side give him the potential to be a back-of-the-rotation starter.

TRACK RECORD: Campbell boosted his draft stock in 2019 after he went 12-1, 2.26 as Arkansas' Friday night starter. Taken in the supplemental second round by the Mariners, he sat after signing because of a heavy college workload and a history of elbow issues. Campbell began taking regular turns on the mound at the Mariners' alternate training site in 2020.

SCOUTING REPORT: A big-bodied righthander with arm strength, Campbell has an above-average fastball that sits 92-95 mph. He commands his heater well and complements it with a trio of competitive, if unspectacular, secondaries. Campbell slowed his slider a few ticks to average 81 mph, adding horizontal break and making it more sweepy. His 82 mph split-changeup can be an above-average pitch with deception and tumble, and his 71-75 mph curveball has lots of depth. He locates his pitches well with average control, keeping them in the bottom of the zone and elevating the fastball when needed. He is the son of an Air Force veteran and is lauded for his makeup.

THE FUTURE: Campbell profiles as a back-end starter. A full-season debut awaits in 2021.

TRACK RECORD: A Spokane, Wash. native who went to Gonzaga, Mills was expected to move quickly after the Mariners drafted him in the third round in 2017. While that hasn't happened quite as planned, Mills' fastball showed a 3 mph increase at the alternate training site and instructional league in 2020. The Mariners added him to the 40-man roster after the season.

SCOUTING REPORT: Mills' strength is a mid-90s fastball that touches 97 mph and seems to come out of his hip with a deceptive, sidearm delivery. His heater has good run and sink and is especially tough for righthanded batters. Mills' above-average slider is a sweeping pitch with deception and tilt. He's dropped the use of his changeup to focus on his two best pitches. Mills is more of a control-over-command type of pitcher, and while his stuff has fluctuated over his career he's been consistently effective.

THE FUTURE: Often compared to Steve Cishek and Darren O'day, Mills should have a similar major league career as a reliable reliever who gives hitters a different look. He is in position to make his MLB debut in 2021.

TRACK RECORD: DeLoach boosted his draft stock with a strong Cape Cod League in 2019 and was off to a good start at Texas A&M before the early end to the 2020 season. That performance led the Mariners to draft him 43rd overall and sign him for $1,729,800. DeLoach reported to the alternate training site in the summer and instructional league in the fall, when he was part of a starting outfield with Julio Rodriguez and Taylor Trammell.

SCOUTING REPORT: DeLoach stands out for his pure hitting ability. He has a sound swing, good strikezone awareness and swings at the right pitches. He rarely strikes out and draws lots of walks. With no other carrying tools, DeLoach's upside will be determined by how much he hits. He has fringe-average raw power and will need to get to it with what is now a line-drive swing. He's an average runner and defender, with a tick below-average arm, and needs to improve his routes in the outfield. He may not have enough range to be a regular in center field, which puts more pressure on his power to emerge.

THE FUTURE: DeLoach could begin 2021 at high Class A. His power production will determine if he has a chance to be regular.

TRACK RECORD: Phillips spent one year at McLennan (Texas) JC instead of following through on his commitment to Louisiana State. He made just four starts before the season was shut down but showed enough to be drafted by the Mariners in the supplemental second round. He signed for $1,050,300 and spent the summer working out remotely before reporting to instructional league.

SCOUTING REPORT: Phillips is best described as a projection pitcher, with his rawness showing in his instructional league outings. He's physical and athletic with a strong frame, but has below-average command and control due to a delivery that lacks direction and isn't repeatable. The stuff is there, though, including a fastball that sits 93-94 mph and touches 97 and a potentially plus slider with powerful twoplane break. After watching Logan Gilbert at the alternate site, Phillips started throwing a similar knucklecurveball held deep in his palm. He rounds out his arsenal with an average circle changeup in the mid 80s.

THE FUTURE: A mound of clay for the Mariners to mold, Phillips won't be ready for full-season ball at the start of 2021. There's a lot to like if he can smooth out his delivery and improve his control.

TRACK RECORD: After hitting .337 in his career at Florida International, Shenton made it to low Class A shortly after being drafted and asserted himself as one of the more advanced hitters in the Seattle organization. He got plenty of at-bats at the alternate training site in 2020.

SCOUTING REPORT: Shenton is an advanced hitter with emerging power. His advanced pitch recognition allows him to control the strike zone and consistently barrel balls to all fields. He showed more pull-side power at the alternate site and should have average pop with more experience. While there are few questions about his bat, where Shenton plays defensively is still to be determined. He's not particularly athletic and is a below-average defender at third base with an average arm. Shenton is a hard worker and has outstanding makeup, so it's not out of the question that he can continue to improve his defense enough to be adequate. His most likely role will have him moving around the infield and outfield corners.

THE FUTURE: Shenton will get plenty of chances to prove his bat can make up for his defensive shortcomings. He has a chance to see the upper levels of the minors in 2021.

TRACK RECORD: After signing for $175,000, the top bonus for a player from Nicaragua in 2018, Perez had a strong pro debut in the Dominican Summer League in 2019. He was slated to make his stateside debit in 2020 before the coronavirus pandemic hit. He spent the year on his own until instructional league, where he started at third base in most games.

SCOUTING REPORT: The switch-hitting Perez is primarily a contact hitter with above-average bat speed, a strong feel for the strike zone and solid rhythm and timing from both sides of the plate. He's gotten stronger but will need to lengthen his stroke to get more separation and unlock his 12-15 home run potential. As his body has stiffened, Perez has lost some lateral movement at third base. He has below-average range, but his hands work well and his plus-plus arm is the best among infielders in the organization. He was already a below-average runner before adding the extra bulk.

THE FUTURE: Perez will likely spend most of 2021 in the Rookie-level Arizona League. His offensive potential gives him an everyday ceiling, but he has a long way to go.

TRACK RECORD: Gerber made it to the majors his third professional season, with the quick arrival primarily due to the need for extra pitching during the pandemic-afflicted 2020 season. The hard-throwing reliever made 17 appearances and posted a 4.02 ERA with six strikeouts in 15.2 innings. The low strikeout rate came after he averaged 13.6 strikeouts per nine innings in the minors.

SCOUTING REPORT: Gerber pitches with a funky, crossfire delivery that adds deception to an electric fastball. His stuff generally was down in the majors, with his fastball averaging 94 mph after sitting 96-98 mph in the minors. His heater has natural sink with armside run from a low three-quarters delivery that makes hitters uncomfortable, but also makes it difficult to command. Gerber's mid-80s slider has flashed plus, and he's shown the ability to command it better than his fastball. Overall his control is below-average.

THE FUTURE: Gerber had only pitched a partial season above high Class A, so more minor league seasoning is in order. If he gets his velocity back up, he has potential to be a high-leverage reliever.

TRACK RECORD: The question of what role would best suit Misiewicz was answered in 2020, when the Mariners made him a reliever. He made the Opening Day roster in 2020 and stayed in the majors throughout the abbreviated season, logging a 4.05 ERA in 21 appearances.

SCOUTING REPORT: With Misiewicz's role more clearly defined, his stuff took a step forward. His fastball sat 94 mph and played up with the nearly 6 feet of extension he generates out of his delivery. Misiewicz's primary pitch is a 90 mph cutter. He controls his cutter better than his four-seamer and it shows plus potential at times, although it got hit hard at times in the majors. His hard, low-80s curveball has sweeping movement but is a below-average pitch. Misiewicz has solid pitchability and above-average control. He was limited to one-inning stints in his debut but has the ability to go multiple innings as a former starter.

THE FUTURE: Misiewicz excelled against lefthanded batters but got hit hard by righties in his debut. With the three-batter minimum rule here to stay, he's going to have to fix that to nail down a permanent spot in the Mariners bullpen.

TRACK RECORD: Gonzalez is a strong, burly outfielder (6 feet, 195 pounds) built along the line of Giants outfielder Heliot Ramos.

SCOUTING REPORT: He's physically mature for his age, combining strength, bat speed and leverage in his swing to generate easy power to all fields in batting practice. He does it against live pitching too, with a good track record of performance in games, both in terms of hitting and hitting for power. Gonzalez is more physically advanced than his peers, and with his aggressive approach and swing path, he may end up having more of a power-over-hit offensive profile, though he doesn't swing and miss excessively. Like Ramos, Gonzalez is more athletic and moves around better in the outfield than his body type suggests. He's an average runner with good defensive instincts for his age.

THE FUTURE: Gonzalez has a chance to develop as a center fielder, though most likely he will end up in a corner. He will make his pro debut in 2021.

TRACK RECORD: The Mariners selected Ramirez from the Astros in the 2019 Rule 5 draft, taking advantage of Houston's 40-man roster crunch. Despite well below-average control, Ramirez's lightning-fast arm was worth the risk. He walked nearly a batter an inning in his 20.2 major league innings in 2020, but still posted a 2.61 ERA and limited opponents to a .130 batting average over 26 appearances.

SCOUTING REPORT: Ramirez sits 95-96 mph with his fastball and it would be a plus-plus pitch if he had just a bit more command. His heater has natural sink and he gets plenty of swings and misses when he throws it in the strike zone. Ramirez also flashes a plus 82 mph slider with sweeping action. He has occasionally used a curveball and changeup, but moving forward he's going to focus strictly on his fastball and slider mix. Ramirez has some deception in his max-effort, high three-quarters delivery. His well below-average control works to his advantage somewhat because batters can't dig in and get comfortable in the box.

THE FUTURE: Considering his relative inexperience, there's a chance Ramirez can harness his control and take on a high-leverage bullpen role. Regardless, he should be back in the Seattle bullpen in 2021.

TRACK RECORD: Acquired from the Rays in the trade that sent Mike Zunino to Tampa Bay after the 2018 season, Fraley had a strong first year with the Mariners that culminated in his major league debut. He was expected to compete for a spot on the Opening Day roster in 2020, but instead stagnated at the plate and spent most of the season at the alternate training site. He got into seven major league games late in the season.

SCOUTING REPORT: Fraley has a solid approach at the plate with strong hands and gap power. He hasn't hit the ball particularly hard in the majors, registering an average exit of 83.1 mph, but he showed some over-the-fence pop in the minors. Fraley's best path toward sticking in the majors would be if he could stay in center field, which is complicated by his waning footspeed. A plus runner at his peak, Fraley has become just a tick above-average as he's aged. His fringe-average arm makes him a poor fit in right field.

THE FUTURE: Fraley is either going to have to hit better or find a way to stay in center field to have a steady role in the majors. He's still on the 40-man roster and will have a chance to win a bench role in 2021

TRACK RECORD: Signed by the Blue Jays for $500,000 in 2017, Rodriguez followed his debut in the Dominican Summer League with a strong showing in the Rookie-level Gulf Coast League. The Mariners acquired him to complete the deadline trade that sent righthander Taijuan Walker to Toronto, and he finished the summer at the Mariners' alternate training site.

SCOUTING REPORT: Rodriguez has whippy bat speed and good hitting instincts, coupled with a natural swing path geared to hit live drives. He uses his hands well and puts plenty of balls in play to project as an above-average hitter with 12-15-home run potential. Rodriguez is an average defender with an above-average arm that should help him in right field. He's added significant weight and strength to his upper half, and his once above-average speed is now below-average. He reported to instructional league and spent his time on conditioning instead of playing in games, and he reportedly lost about 10 pounds of excess weight.

THE FUTURE: Rodriguez should be ready for low Class A in 2021. He will need to continue his conditioning work and closely monitor his fitness.

TRACK RECORD: The son of former Pirates infielder Kevin Polcovich, Kaden played two years at Northwest Florida State JC before heading to Oklahoma State for his junior year. He hit .344 in 18 games for the Cowboys before the season shut down and was drafted by the Mariners in the third round. Polcovich signed for $575,000 and spent the summer at the Mariners' alternate training site.

SCOUTING REPORT: Like fellow OSU alum Donovan Walton, drafted four years earlier by the Mariners, Polcovich stands out for his versatility and grinder mentality. He split time at second and third base in college and saw significant time in the outfield in the Cape Cod League. A switch-hitter with a solid swing and excellent barrel control from both sides of the plate, Polcovich has a knack for getting on base and sneaky fringe-average power. He's not likely to be more than a fringe-average defender with an average arm because he struggles with his footwork on ground balls,

THE FUTURE: Polcovich should be adequate in a utility role provided his bat develops. He should be ready for a full-season assignment in 2021.

TRACK RECORD: The most significant accomplishment for Carlson in 2020 was finally getting back on the mound after a litany of injuries, most notably Tommy John surgery in 2018. Carlson took regular turns on the mound during instructional league with mixed results, but most importantly he stayed healthy and built confidence.

SCOUTING REPORT: Carlson has not pitched in an official game since 2017 and is still shaking off the rust. He worked on developing cleaner mechanics during his injury rehab time, resulting in a more efficient and free delivery. Carlson's fastball reached 96 mph with late life and sink prior to surgery but sat 91-93 mph with sneaky darting action during instructs. His secondary pitches are all right around average, with his slider the most promising. His slider shows a good amount of sweep and depth, but he needs to throw it harder to make it an above-average pitch. Carlson commands his 11-to-5 curveball for strikes early in counts and also throws a potentially average changeup with soft fade. He throws them all for strikes with average control.

THE FUTURE: Carlson's future depends on how his stuff comes back. The hope is it will and that he can become a back-end starter.

TRACK RECORD: Bins got plenty of scout looks at Fresno State when he was the catcher for Cubs 2019 first-rounder Ryan Jensen. The Mariners drafted him in the 11th round and signed him for an over-slot $350,000. Bins made his pro debut after signing at short-season Everett and, after 2020 spring training was cut short by the coronavirus pandemic, got back on the field during instructional league.

SCOUTING REPORT: Bins has above-average raw power and makes plenty of loud contact. He shows feel for the barrel, but his below-average bat speed limits his offensive ceiling. He has a hitchy, shoulder-heavy rotational swing that leads to a lot of strikeouts. Bins controls the strike zone and draws his fair share of walks, leading to projections he'll be a three true outcome--walk, strikeout or home run--hitter. Bins has made positive strides defensively. He's athletic and has good hands behind the plate but needs to be more consistent in blocking and receiving. His above-average arm strength plays down a bit because of a slow transfer.

THE FUTURE: Bins profiles best as a backup catcher. His solid makeup and the ability to learn gives him a chance to surpass that projection.

TRACK RECORD: Clase signed with the Mariners for $35,000 in 2018 and delivered an intriguing pro debut in the Dominican Summer League the following year. He was set to make his stateside debut in 2020 before the coronavirus pandemic canceled the minor league season. He got back on the field for instructional league in the fall.

SCOUTING REPORT: Clase has packed on 30 pounds of muscle since signing, giving him a brick-like build. Impressively, he's maintained his plus-plus speed as he's added the weight. Clase has a slasher's approach in games with excellent bat speed and controls the strike zone. His approach and swing aren't conducive to hitting for power, so he'll need to make adjustments to get the most from his newfound strength. Namely, he needs to get better at learning which pitches he can impact. Clase relies on his natural speed and athleticism in the outfield but needs to improve his routes. He may project better as a corner outfielder even with his speed.

THE FUTURE: Clase has strength and athleticism to dream on, but he's still very raw. He'll be 18 on Opening Day 2021 and will begin in the Rookie-level Arizona League.