2025 Stats
W-L
0-0
ERA
0.00
WHIP
2.00
K
0
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
Santos was acquired by Seattle to deepen its bullpen prior to the 2024 season, but a variety of injuries limited Santos to just over seven innings of work on the season. He missed two months with right bicep inflammation related to a nerve issue, and previously missed more than three months with a severe lat strain. This all came on the heels of his 2023 season ending early with right elbow inflammation. To be sure, strains and inflammations are the last thing you want to see from a hard-throwing reliever, especially one so reliant on a dastardly slider. The lost time and injury risk have likely led to Santos moving down from the primary setup man or potential closer to someone more likely to work in specific leverage situations against righty-heavy lineups unless something changes with his repertoire and his health. The Seattle bullpen is not exactly set it stone, so anything is possible if Santos's body doesn't let him down once again. Read Past Outlooks
Healthy ahead of spring training
Mariners president of baseball operations Jerry Dipoto said Monday that Santos has already reported to the team's spring training complex and has been throwing bullpen sessions, Ryan Divish of The Seattle Times reports.
ANALYSIS
Santos made only eight appearances for Seattle in 2024 due to multiple arm issues, but he finished the season healthy and will head into spring training without limitations. The 25-year-old can be a key member of the Mariners' bullpen if he can stay on the bump, but he's a major health risk.
Santos made only eight appearances for Seattle in 2024 due to multiple arm issues, but he finished the season healthy and will head into spring training without limitations. The 25-year-old can be a key member of the Mariners' bullpen if he can stay on the bump, but he's a major health risk.
Pitching Stats
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2025
2024
2023
2022
2021
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
11
Last 10 Games
11
Last 5 Games
11
How many pitches does Gregory Santos generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Gregory Santos generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
-5%
BAA vs RHP
2025
-100%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .265 | 39 | 8 | 35 | 0 | |||
| Since 2023vs Right | .251 | 33 | 11 | 42 | 2 | |||
| 2025vs Left | 1.000 | 0 | 1 | 1 | 0 | |||
| 2025vs Right | .000 | 0 | 0 | 0 | 0 | |||
| 2024vs Left | .385 | 4 | 1 | 5 | 0 | |||
| 2024vs Right | .125 | 2 | 0 | 2 | 0 | |||
| 2023vs Left | .246 | 35 | 6 | 29 | 0 | |||
| 2023vs Right | .268 | 31 | 11 | 40 | 2 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
-4%
ERA on Road
2025
No Stats
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 3.57 | 1.21 | 40.1 | 8.0 | 1.8 | ||||
| Since 2023Away | 3.41 | 1.37 | 34.1 | 9.4 | 2.9 | ||||
| 2025Home | 0.00 | 2.00 | 1.0 | 0.0 | 9.0 | ||||
| 2025Away | 0 | 0 | 0 | 0 | 0 | ||||
| 2024Home | 6.75 | 1.25 | 4.0 | 4.5 | 0.0 | ||||
| 2024Away | 2.70 | 0.90 | 3.1 | 10.8 | 2.7 | ||||
| 2023Home | 3.31 | 1.19 | 35.1 | 8.7 | 1.8 | ||||
| 2023Away | 3.48 | 1.42 | 31.0 | 9.3 | 2.9 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Gregory Santos compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
0.00K/9
0.0BB/9
9.0HR/9
0.0Fastball
98.6 mphERA
0.00WHIP
2.00BABIP
.262GB/FB
0.00Left On Base
100.0%Exit Velocity
0.0 mphBarrels/BBE
0.0%Spin Rate
0 rpmBalls Hit 95+ MPH
0.0%Swinging Strike
8.3%Prospect Rankings History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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2024 Fantasy Outlook
Santos was designated for assignment by San Francisco last off-season, only to be acquired by the White Sox soon afterwards. Despite having minimal experience at the big-league level, the hard-throwing right-hander made Chicago's opening day bullpen. He spent the first two months working in low leverage, but his solid body of work, good control (5.9% walk rate) and excellent slider (.196 BA, 37.5% whiff rate) earned him higher-leverage opportunities as the season went on. The 24-year-old converted his first save in early July, then stepped into closing duties once Chicago unloaded their veteran relievers at the trade deadline. Santos totaled five saves before right elbow inflammation ended his season in mid-September. He was expected to open 2024 as the White Sox's primary closer but was dealt to Seattle in early February, where he likely won't have much fantasy value in a significantly better bullpen.
More Fantasy News
Wraps '24 with scoreless efforts
Santos, who was activated from the injured list last Monday, subsequently made two relief appearances during which he fired two scoreless innings while allowing one hit and recording one strikeout.
ANALYSIS
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Activated from IL
The Mariners reinstated Santos (biceps) from the 15-day injured list Monday, Daniel Kramer of MLB.com reports.
ANALYSIS
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Two more scoreless rehab outings
Santos (biceps) continued his rehab assignment with Triple-A Tacoma with one-inning scoreless appearances Wednesday and Saturday, allowing one hit and two walks while recording a strikeout over that span.
ANALYSIS
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Another rehab appearance Sunday
Santos (bicep) retired two batters and issued two walks in a rehab appearance for Triple-A Tacoma on Sunday.
ANALYSIS
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Completes third rehab outing
Santos (biceps) allowed an earned run on a walk over two-thirds of an inning in Triple-A Tacoma's win over Oklahoma City on Friday. He struck out two.
ANALYSIS
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