Colt Emerson

20-Year-Old ShortstopSS
Seattle Mariners AAA
2026 Fantasy Outlook
Barring a surprise offseason move, Emerson has a real chance to be the Mariners' starting third baseman as early as Opening Day. He has always been young for his levels while projecting for at least above-average power and with at least above-average hitting ability. His run in the second half of 2025 was perhaps his most impressive stretch to date, slashing .307/.405/.515 with nine home runs, nine steals (on 11 attempts), an 11.3 percent walk rate and a 17.5 percent strikeout rate in 59 games across High-A, Double-A and Triple-A. He wasn't at Triple-A long (just six games), but Emerson logged a 64.7 HardHit%, 35.3 percent line-drive rate and 174 wRC+. The lefty-hitting Emerson doesn't turn 21 until after the All-Star break, so while he isn't an elite athlete, he's a legitimate hitting phenom and could end up with a plus hit tool and plus power. A shortstop by trade, Emerson will add third base eligibility shortly after his big-league debut, which is a nice bonus. Read Past Outlooks
RANKS
From Preseason
#405
ADP
$Signed a $3.8 million contract with the Mariners in July of 2023.
Picks up first two spring hits
SSSeattle Mariners  AAA
February 25, 2026
Emerson went 2-for-3 with two RBI and a run scored in Tuesday's Cactus League matchup against the White Sox.
Analysis
It was a nice showing for Emerson, who'd gone 0-for-5 in his first three spring appearances. The 20-year-old infielder is competing with Cole Young to earn the starting second-base job on Opening Day, though it seems more likely that Emerson will start the year with Triple-A Tacoma. He's coming off an excellent campaign in the minors, where he slashed .285/.383/.458 with 16 home runs and 14 stolen bases in 130 games across three levels. Even if Emerson doesn't break camp with the Mariners, he's almost certain to make his MLB debut at some point in 2026.
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Minor League Left/Right Batting Splits (AAA)
Since 2023
 
 
+117%
OPS vs LHP
2025
 
 
+270%
OPS vs LHP
2024
No Stats
2023
No Stats
OPS PA R HR RBI SB AVG OBP SLG
Since 2023vs Left 1.929 7 2 7 .500 .429 1.500
Since 2023vs Right .888 20 0 2 .313 .450 .438
2025vs Left 2.310 7 2 7 .500 3.000 1.500
2025vs Right .625 20 0 2 .313 8.050 .438
2024vs Left 0 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0 0
2023vs Left 0 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0 0
Prospect Rankings History
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Past Fantasy Outlooks
2025
2024
Emerson is a really good pure hitter, but the rest of the overall fantasy package is to be determined. He walked more (18.1 BB%) than he struck out (14.0 K%) while hitting .293 as an 18-year-old at Single-A, and he hit .374 in 24 games in 2023 and hit .370 as one of the youngest players in the Arizona Fall League this year. Emerson struggled to a .225/.331/.317 slash line in 29 games at High-A shortly after his 19th birthday, and he missed a lot of time, especially in the first half, with a broken foot. Even amid his struggles in the Northwest League, Emerson boasted a 0.50 BB/K, so he was hardly overmatched. Emerson is a doubles maven, tallying nine doubles in 13 AFL games and 27 doubles in 94 career games in the minors, but he didn't homer in the AFL and has six homers thus far in pro ball. He hits the ball very hard (31.0 Hard%) for a teenage shortstop, but he ran groundball rates over 48 percent at Single-A and High-A last year. Emerson went 15-for-17 on stolen-base attempts in 70 games, so while he only grades as a 50-grade runner, he should be able to chip in double-digit steals early in his career. More over-the-fence power will certainly come, but it's unclear if he'll settle in as a 15-20 homer threat or a 20-30 homer threat.
The Mariners snagged three seven-figure prep hitters in the first 30 picks of the 2023 MLB Draft, and Emerson got the biggest bonus ($3.8 million) and was first off the board at No. 22 overall. A lefty-hitting shortstop, Emerson has already gained good weight since the end of his high school season, up to 6-foot-2 and around 200 pounds. He slashed .374/.496/.550 with two home runs, 10 doubles and eight steals on eight attempts in 24 games across the Arizona Complex League and the Cal League. Emerson has been billed as hit-over-power, and indeed, he had a 17.5 K% and a 14.9 BB% in his pro debut, so the hit tool easily projects as plus. Defensively, he can play shortstop but may move to third base as needed. He isn't a plus runner, but has excellent instincts and gets the most out of his physical tools. Emerson could reach the majors sometime in 2025.
More Fantasy News
Could need more seasoning
SSSeattle Mariners  AAA
February 5, 2026
The Mariners could give Emerson more seasoning at Triple-A Tacoma following the acquisition of Brendan Donovan, Daniel Kramer of MLB.com reports.
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Gets invite to MLB camp
SSSeattle Mariners  AAA
January 30, 2026
The Mariners have extended Emerson an invitation to major-league camp during spring training.
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Will compete for Opening Day spot
SSSeattle Mariners  AAA
October 22, 2025
The Mariners are expected to give Emerson "runway" to win an Opening Day roster spot, Adam Jude of the Seattle Times reports.
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Set for Triple-A debut
SSSeattle Mariners  AAA
September 15, 2025
The Mariners promoted Emerson from Double-A Arkansas to Triple-A Tacoma on Monday, Ryan Divish of The Seattle Times reports.
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Bumped up to Double-A
SSSeattle Mariners  AAA
August 3, 2025
The Mariners will promote Emerson from High-A Everett to Double-A Arkansas during the upcoming week, Adam Jude of The Seattle Times reports.
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