Colt Emerson

20-Year-Old ShortstopSS
Seattle Mariners AAA
2025 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
Rest of Season From Preseason
Signed a $3.8 million contract with the Mariners in July of 2023.
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.
Analysis
Most of Emerson's playing time in the minors has come at shortstop, but he's also played some second base and third base. With Eugenio Suarez entering free agency, the hot corner appears the most likely path for Emerson, who is expected to compete with Ben Williamson for the starting job. Emerson is just 20 and has only six games of experience at Triple-A Tacoma, but Jude notes that the Mariners considered putting Emerson on their playoff roster taxi squad. The left-handed hitter slashed .285/.383/.458 with 16 home runs and 14 stolen bases over 130 games across three levels in the minors in 2025.
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Batting Stats
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Minor League Game Log
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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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2024 Fantasy Outlook
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.
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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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Adjustments paying off
SSSeattle Mariners  AAA
July 10, 2025
Emerson is hitting .333 with three home runs, two steals and a 12:12 K:BB in his last 20 games for High-A Everett.
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Sent to minor-league camp
SSSeattle Mariners  AAA
March 12, 2025
The Mariners reassigned Emerson to minor-league camp Wednesday, Shannon Drayer of SeattleSports.com reports.
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Receives spring training invite
SSSeattle Mariners  AAA
January 30, 2025
The Mariners have extended Emerson an invitation to big-league camp during spring training.
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