60-Day IL
Injury Knee
Est. Return 6/23/2025
2025 Stats
W-L
1-1
ERA
5.14
WHIP
2.29
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
Transferred to 60-day IL
Santos (knee) was transferred to the 60-day injured list by Seattle on Tuesday.
ANALYSIS
Santos is dealing with right knee inflammation. The Mariners needed his 40-man roster spot in order to select Samad Taylor's contract from Triple-A Tacoma.
Santos is dealing with right knee inflammation. The Mariners needed his 40-man roster spot in order to select Samad Taylor's contract from Triple-A Tacoma.
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
16
Last 10 Games
16
Last 5 Games
19
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
-3%
BAA vs RHP
2025
-17%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .264 | 39 | 12 | 37 | 0 | |||
| Since 2023vs Right | .257 | 33 | 14 | 47 | 2 | |||
| 2025vs Left | .333 | 0 | 5 | 3 | 0 | |||
| 2025vs Right | .278 | 0 | 3 | 5 | 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
-13%
ERA at Home
2025
-87%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 3.45 | 1.24 | 44.1 | 7.3 | 2.0 | ||||
| Since 2023Away | 3.96 | 1.51 | 36.1 | 8.9 | 4.0 | ||||
| 2025Home | 1.80 | 1.60 | 5.0 | 0.0 | 5.4 | ||||
| 2025Away | 13.50 | 4.00 | 2.0 | 0.0 | 22.5 | ||||
| 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
10.3HR/9
0.0Fastball
97.3 mphERA
5.14WHIP
2.29BABIP
.288GB/FB
3.40Left On Base
62.5%Exit Velocity
82.6 mphBarrels/BBE
4.3%Spin Rate
2444 rpmBalls Hit 95+ MPH
27.7%Swinging Strike
4.3%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
Placed on injured list
The Mariners placed Santos on the 15-day injured list Friday with right knee inflammation.
ANALYSIS
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Optioned to Triple-A
The Mariners optioned Santos to Triple-A Tacoma on Wednesday, Daniel Kramer of MLB.com reports.
ANALYSIS
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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
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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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