2025 Stats
W-L
0-1
ERA
3.60
WHIP
1.00
K
4
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
Castillo, for all his abilities, has been rather inconsistent in recent seasons. He has made 30 or more starts in three of the past four seasons and in five of the last six full seasons, but he has just twice won 12 or more games, and his ERA has had a 1.3 run variance. The 2024 season was not his best effort, as a hamstring injury shut him down for good in mid-September. Sixteen of his 25 home runs were of the solo shot variety, yet he still had his highest ERA of the past three seasons. The related issue was a decline in strikeouts, as the 24.3 percent strikeout rate was three full percentage points down from his 2022 and 2023 efforts, and his lowest since that troublesome 2021 season with Cincinnati. A look at the numbers show the changeup, once his signature pitch, was arguable his worst pitch. Castillo is now primarily a fastball and slider guy, and while the four-seamer and slider duo has served him well the past two seasons, he needs a third pitch to re-emerge, as lefties were entirely too comfortable against him in 2024. This is not the making of a fantasy ace. Read Past Outlooks

Saddled with loss
Castillo (0-1) was charged with the loss Friday against the Athletics after giving up two runs on three hits and two walks while striking out four over five innings.
ANALYSIS
Castillo kept the A's off the board until the fifth inning, when a Lawrence Butler double followed by a Brent Rooker home run put his team in a 2-0 hole. Unfortunately for Castillo, the Athletics' pitching staff was able to keep the Mariners off the board for the whole game, so the 32-year-old will end up starting the year with a loss despite a respectable effort on his part. He'll hope for a bit more run support when the Tigers come to town next week.
Castillo kept the A's off the board until the fifth inning, when a Lawrence Butler double followed by a Brent Rooker home run put his team in a 2-0 hole. Unfortunately for Castillo, the Athletics' pitching staff was able to keep the Mariners off the board for the whole game, so the 32-year-old will end up starting the year with a loss despite a respectable effort on his part. He'll hope for a bit more run support when the Tigers come to town next week.
Pitching Stats
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2024
2023
2022
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2020
2019
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Minor League Game Log

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Pitching Appearances Breakdown
Average Pitch Count
83
Last 10 Games
83
Last 5 Games
83
How many pitches does Luis Castillo 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 Luis Castillo 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
-18%
BAA vs RHP
2025
-38%
BAA vs LHP
BAA | K | BB | H | HR | ||||
---|---|---|---|---|---|---|---|---|
Since 2023vs Left | .249 | 186 | 64 | 177 | 38 | |||
Since 2023vs Right | .205 | 212 | 41 | 144 | 16 | |||
2025vs Left | .125 | 2 | 1 | 1 | 0 | |||
2025vs Right | .200 | 2 | 1 | 2 | 1 | |||
2024vs Left | .275 | 67 | 27 | 87 | 18 | |||
2024vs Right | .205 | 108 | 20 | 71 | 7 | |||
2023vs Left | .229 | 117 | 36 | 89 | 20 | |||
2023vs Right | .205 | 102 | 20 | 71 | 8 | |||
More Splits→ | View More Split Stats |
Home/Away Pitching Splits
Since 2023
-20%
ERA at Home
2025
-100%
ERA on Road
ERA | WHIP | IP | K/9 | BB/9 | |||||
---|---|---|---|---|---|---|---|---|---|
Since 2023Home | 3.13 | 1.04 | 207.0 | 10.5 | 2.2 | ||||
Since 2023Away | 3.91 | 1.24 | 170.1 | 8.3 | 2.9 | ||||
2025Home | 3.60 | 1.00 | 5.0 | 7.2 | 3.6 | ||||
2025Away | 0 | 0 | 0 | 0 | 0 | ||||
2024Home | 3.15 | 1.08 | 97.0 | 9.9 | 1.7 | ||||
2024Away | 4.25 | 1.28 | 78.1 | 7.8 | 3.3 | ||||
2023Home | 3.09 | 1.00 | 105.0 | 11.1 | 2.6 | ||||
2023Away | 3.62 | 1.21 | 92.0 | 8.7 | 2.5 | ||||
More Splits→ | View More Split Stats |
Stat Review
How does Luis Castillo compare to other starting pitchers?
This section compares his stats with all starting pitcher seasons from the previous three seasons (minimum 120 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 120 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 120 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
2.00K/9
7.2BB/9
3.6HR/9
1.8Fastball
94.4 mphERA
3.60WHIP
1.00BABIP
.165GB/FB
3.33Left On Base
83.3%Exit Velocity
0.0 mphBarrels/BBE
0.0%Spin Rate
0 rpmBalls Hit 95+ MPH
0.0%Swinging Strike
12.1%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Past Fantasy Outlooks
2024
2023
2022
2021
2020
2019
2018
2017
The 31-year-old was acquired by the Mariners at the 2022 trade deadline and inked a five-year extension two months later; during his first full season with the team in 2023 he posted a 3.34 ERA, 1.10 WHIP and 219:56 K:BB in 197 innings. The campaign ended on a sour note, however, with nine runs allowed in Castillo's final two starts, including a 2.2-frame outing against Texas that eliminated Seattle from playoff contention. His strikeout and walk rates (27.3 percent and 7.0 percent, respectively) stayed stable, but his 1.3 HR/9 was the highest since his sophomore season in 2018. Castillo typically excelled at inducing groundballs while playing for the Reds with a career rate north of 50 percent, but he saw his flyball rate jump nearly nine points to 42.4 percent in 2023 while his groundball rate dipped below 40 percent. A barrel rate of 9.4 percent and hard-hit rate of 41.8 percent each represent career worsts, which also lines up with a 3.81 xFIP. Some regression may be in store for Castillo if he's unable to rein in those trends, but he's still likely a fairly safe bet for fantasy managers in 2024 given his track record.
More Fantasy News

Solid spring continues Saturday
Castillo didn't factor into the decision in Saturday's Cactus League game against San Diego after giving up two runs on five hits over 4.2 innings. He struck out four.
ANALYSIS
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Throws side session Monday
Castillo (hamstring) tossed a bullpen session Monday, Ryan Divish of The Seattle Times reports.
ANALYSIS
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Not ready for Houston series
Castillo (hamstring) is making good progress and has thrown off a mound, but he's not expected to return from the 15-day injured list for the Mariners' three-game series in Houston that begins Monday, Shannon Drayer of SeattleSports.com reports.
ANALYSIS
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On track with progress
Castillo appears to be making good progress in his recovery from a hamstring strain, and the Mariners remain cautiously optimistic that he'll be activated from the 15-day injured list when first eligible Monday, MLB.com reports. "Progressing as he should be," manager Dan Wilson said. "I don't think there's any expected date, right now, of his return, but progressing as he has. I know Luis is very diligent about getting his work in and trying to get healthy, and I think as far as we know right now, he's doing well."
ANALYSIS
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Out with hamstring strain
Castillo was placed on the 15-day injured list Tuesday due to a Grade 2 left hamstring strain, Ryan Divish of The Seattle Times reports.
ANALYSIS
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Latest Fantasy Rumors

Recent trade interest from Orioles
The Orioles and Mariners "have talked before and in recent days" about a trade that would send Castillo to Baltimore, Jon Morosi of MLB Network reports.
ANALYSIS
It's not clear whether some of those discussions took place after the Orioles signed Charlie Morton this past Friday. Castillo is owed $72.45 million over the next three years and has a full no-trade clause, complicating any potential deal. However, the Mariners have reportedly discussed him in trade scenarios this offseason, with the thought that they could either swap him for a bat or clear payroll space and sign a position player.
It's not clear whether some of those discussions took place after the Orioles signed Charlie Morton this past Friday. Castillo is owed $72.45 million over the next three years and has a full no-trade clause, complicating any potential deal. However, the Mariners have reportedly discussed him in trade scenarios this offseason, with the thought that they could either swap him for a bat or clear payroll space and sign a position player.