Diego Castillo
Diego Castillo
27-Year-Old PitcherRP
Seattle Mariners
2021 Fantasy Outlook
Rays relievers are typically more useful in formats that give some value to bullpen arms beyond just saves, as 12 different Rays picked up a save last season. Castillo was one of the more valuable members of that group regardless of format, as he finished second on the team with four saves while posting a 1.66 ERA in 21.2 innings. His underlying numbers don't back up that level of dominance, as it took a .176 BABIP and an unsustainable 100% strand rate to get him there. His 4.53 FIP, which factors in a decent 25.8 K% and a poor 12.4 BB%, both career worsts, paints a considerably less impressive picture. Small-sample caveats apply to both his ERA and FIP, however, and finishing with a mark in the realm of his 3.30 ERA and 3.53 FIP from his first two years wouldn't be a surprise. That would leave him shy of typical closer material, though the Rays' usage patterns probably mean he'll still get some saves. Read Past Outlooks
RANKSFrom Preseason
#292
ADP
$Traded to the Mariners in July of 2021.
Succeeding in set-up role
PSeattle Mariners
September 24, 2021
Castillo, who secured his 10th hold against the Athletics on Thursday with a scoreless eighth inning during which he allowed a walk and a strikeout, has three holds overall in the last four games.
ANALYSIS
The big right-hander is just 2-for-5 in save opportunities since joining the Mariners at the trade deadline, and with more reliable ninth-inning options on hand for manager Scott Servais, Castillo has primarily transitioned back into the seventh- and eighth-inning role he often filled during his time with the Rays. The return to a healthy dose of set-up work has mostly agreed with Castillo, who's posted a 2-0 record, 1.93 ERA, 1.07 WHIP, 11:2 K:BB and five holds over 9.1 innings in September.
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Pitching Stats
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2021
2020
2019
2018
2021 MLB Game Log
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2020 MLB Game Log
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2019 MLB Game Log
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2018 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
15
Last 10 Games
15
Last 5 Games
14
How many pitches does Diego 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+
 
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+
 
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 Diego Castillo generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
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 2019
 
 
-13%
BAA vs RHP
2021
 
 
-6%
BAA vs LHP
2020
 
 
-20%
BAA vs LHP
2019
 
 
-24%
BAA vs RHP
BAA Batters K BB H 2B 3B HR
Since 2019vs Left .224 214 56 26 41 5 0 9
Since 2019vs Right .196 381 116 28 67 13 2 10
2021vs Left .185 80 18 11 12 1 0 5
2021vs Right .197 138 50 6 25 5 0 3
2020vs Left .136 28 6 5 3 1 0 0
2020vs Right .170 59 17 6 9 2 0 3
2019vs Left .271 106 32 10 26 3 0 4
2019vs Right .205 184 49 16 33 6 2 4
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2019
 
 
-19%
ERA at Home
2021
 
 
-50%
ERA at Home
2020
 
 
-3%
ERA on Road
2019
 
 
-2%
ERA at Home
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2019Home 2.62 0.93 75.2 8 5 14 10.6 2.5 1.2
Since 2019Away 3.23 1.32 69.2 4 8 14 10.7 4.3 1.2
2021Home 1.80 0.84 25.0 2 2 8 11.2 2.5 1.1
2021Away 3.60 1.10 30.0 2 3 8 11.1 3.0 1.5
2020Home 1.69 0.94 10.2 1 0 2 10.1 4.2 0.8
2020Away 1.64 1.18 11.0 2 0 2 9.0 4.9 1.6
2019Home 3.38 0.98 40.0 5 3 4 10.4 2.0 1.4
2019Away 3.45 1.60 28.2 0 5 4 11.0 5.3 0.6
More Splits View More Split Stats
Stat Review
How does Diego Castillo 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.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
4.00
 
K/9
11.1
 
BB/9
2.8
 
HR/9
1.3
 
Fastball
94.7 mph
 
ERA
2.78
 
WHIP
0.98
 
BABIP
.250
 
GB/FB
1.50
 
Left On Base
77.1%
 
Exit Velocity
80.8 mph
 
Barrels/BBE
5.0%
 
Spin Rate
2159 rpm
 
Balls Hit 95+ MPH
25.4%
 
Swinging Strike
15.3%
 
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Recent RotoWire Articles Featuring Diego Castillo
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8 days ago
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29 days ago
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Past Fantasy Outlooks
2020
2019
Castillo proved to be a jack-of-all-trades for the Rays in 2019, working as both a setup man and closer -- finishing with 17 holds and eight saves -- while also starting six games as an opener. He was dialed in for the first two months of the season before struggling in June and subsequently landing on the injured list with a shoulder issue. Castillo returned after the All-Star break and showed no ill effects, posting a 2.88 ERA and 1.17 WHIP over 34.1 second-half innings with a 43:10 K:BB and 0.8 HR/9 over that stretch. His skill set, which includes a fastball that touches triple digits with a swing-and-miss slider, is reminiscent of a closer; while Emilio Pagan was traded, the Rays used a committee at times and could do so again in 2020 as they still have a plethora of viable endgame options. Either way, Castillo should see high-leverage work and is a good bet to see at least some save chances.
Castillo posted strong numbers in his debut campaign, recording a 3.18 ERA backed up by a strong 29.3% strikeout rate. He technically logged 11 starts, though all came firmly in the "opener" role, as none lasted more than two innings. With a 98-mph fastball, an 89-mph slider and a strong minor-league track record, Castillo's performance looks legitimate and repeatable. He has the skill set to eventually get a look in the closer role. The team may prefer his flexibility and willingness to work in the opener role for the time being. The job exposes him to the toughest part of the opposing order more often and hurts his chances for wins, but also gives him to a larger workload than is typical for a reliever -- he worked 1.3 innings per outing last season -- which helps him rack up more strikeouts.
More Fantasy News
Nabs fourth win
PSeattle Mariners
September 14, 2021
Castillo (4-5) recorded the win in a victory over the Red Sox on Monday, firing a perfect seventh inning during which he recorded two strikeouts.
ANALYSIS
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Collects third win
PSeattle Mariners
September 8, 2021
Castillo (3-5) earned the win Wednesday over Houston. He allowed one hit and struck out three in a scoreless inning.
ANALYSIS
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Earns save in return to action
PSeattle Mariners
September 5, 2021
Castillo picked up the save against the Diamondbacks on Saturday, pitching a scoreless inning during which he gave up one hit and didn't walk or strike out any batters.
ANALYSIS
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Returns from injured list
PSeattle Mariners
September 4, 2021
Castillo (shoulder) was activated off the injured list Saturday.
ANALYSIS
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Should return over weekend
PSeattle Mariners
Shoulder
September 1, 2021
The Mariners plan on sending Castillo (shoulder) to their rookie-level Arizona Complex League affiliate for a one-game rehab assignment before activating him from the 10-day injured list Saturday or Sunday, Corey Brock of The Athletic reports.
ANALYSIS
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