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
Signs with Giants as NRI
Santos signed a minor-league contract with the Giants on Tuesday that includes an invitation to spring training, Francys Romero of BeisbolFR.com reports.
ANALYSIS
Santos first reached the majors with the Giants in 2021 before being traded to the White Sox three years ago. The 26-year-old had a tough time with injuries the past two seasons with the Mariners, making a total of only 16 appearances due to arm and knee problems. Santos is recovered from April arthroscopic right knee surgery and has a chance to win a spot in the Giants' bullpen.
Santos first reached the majors with the Giants in 2021 before being traded to the White Sox three years ago. The 26-year-old had a tough time with injuries the past two seasons with the Mariners, making a total of only 16 appearances due to arm and knee problems. Santos is recovered from April arthroscopic right knee surgery and has a chance to win a spot in the Giants' bullpen.
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 |
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 |
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
Gets non-tendered by Mariners
The Mariners non-tendered Santos (knee) on Friday, Francys Romero of BeisbolFR.com reports.
ANALYSIS
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Beginning rehab assignment
Santos (knee) is slated to begin a minor-league rehab assignment with Triple-A Tacoma on Saturday, Shannon Drayer of SeattleSports.com reports.
ANALYSIS
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Aiming for mid-September return
Santos (knee) is expected to begin a rehab assignment soon and is hopeful to return in mid-September, Adam Jude of The Seattle Times reports.
ANALYSIS
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Throwing light bullpen sessions
Mariners general manager Justin Hollander said Monday that Santos (knee) threw three light bullpen sessions last week, Teren Kowatsch of SI.com reports.
ANALYSIS
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Transferred to 60-day IL
Seattle transferred Santos (knee) fro the 15-day injured list to the 60-day IL on Sunday.
ANALYSIS
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Latest Fantasy Rumors
Would make $1.3 million in MLB
Santos' minor-league contract with the Giants will pay him $1.3 million if he makes the Opening Day roster, reports Francys Romero of BeisbolFR.com.
ANALYSIS
The right-hander posted a 3.39 ERA in 60 appearances with the White Sox in 2023, but after being traded to the Mariners he has struggled to stay healthy the past two seasons. Santos will likely need a strong showing during spring training to secure a roster spot, but he could be a valuable bullpen piece for San Francisco if he can get back on track.
The right-hander posted a 3.39 ERA in 60 appearances with the White Sox in 2023, but after being traded to the Mariners he has struggled to stay healthy the past two seasons. Santos will likely need a strong showing during spring training to secure a roster spot, but he could be a valuable bullpen piece for San Francisco if he can get back on track.