Blas Castano

Blas Castano

26-Year-Old PitcherRP
Seattle Mariners AAA
2025 Fantasy Outlook
An undersized (5-foot-10, 162 pounds) 26-year-old righty with no big-league experience, Castano was added to the Mariners' 40-man roster this offseason to protect him from the Rule 5 draft. Castano originally signed with the Yankees in 2018 out of the Dominican Republic but was released in 2023, which is when Seattle signed him. He split 2024 between Double-A and Triple-A, logging an excellent 53.5 percent groundball rate, but a mediocre 12.0 K-BB% in 125.1 innings. He only pitches out of the stretch and may make his big-league debut as a reliever, but Castano has enough pitches to be a back-end starter if injuries were to clear a path in 2025. Read Past Outlooks
$Signed a one-year contract with the Mariners in May of 2025.
Demoted to Triple-A
PSeattle Mariners  AAA
May 29, 2025
The Mariners optioned Castano to Triple-A Tacoma on Thursday.
ANALYSIS
Castano joined the Mariners' bullpen after being called up May 23 and made his MLB debut May 28. It was the lone appearance he made as he allowed three earned runs on three hits and two walks across three innings of relief. As part of a corresponding move Thursday, Casey Lawrence was selected from Triple-A Tacoma
Read More News
Pitching Stats
Loading Pitching Stats...
2025
2025 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Pitching Game Log...
Minor League Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Pitching Appearances Breakdown
Average Pitch Count
50
Last 10 Games
50
Last 5 Games
50
How many pitches does Blas Castano 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 Blas Castano 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 2023
 
 
-100%
BAA vs RHP
2025
 
 
-100%
BAA vs RHP
2024
No Stats
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .308 16 1 2 4 2 0 1
Since 2023vs Right 0 0 0 0 0 0 0 0
2025vs Left .308 16 1 2 4 2 0 1
2025vs Right 0 0 0 0 0 0 0 0
2024vs Left 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0
2023vs Left 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0
Home/Away Pitching Splits
Since 2023
 
 
-100%
ERA on Road
2025
 
 
-100%
ERA on Road
2024
No Stats
2023
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 9.00 2.00 3.0 0 0 0 3.0 6.0 3.0
Since 2023Away 0 0 0 0 0 0 0 0 0
2025Home 9.00 2.00 3.0 0 0 0 3.0 6.0 3.0
2025Away 0 0 0 0 0 0 0 0 0
2024Home 0 0 0 0 0 0 0 0 0
2024Away 0 0 0 0 0 0 0 0 0
2023Home 0 0 0 0 0 0 0 0 0
2023Away 0 0 0 0 0 0 0 0 0
Minor League Left/Right Pitching Splits (AAA)
Since 2023
 
 
-14%
BAA vs RHP
2025
 
 
-28%
BAA vs LHP
2024
 
 
-30%
BAA vs RHP
2023
 
 
-100%
BAA vs RHP
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .286 201 36 19 50 12 1 8
Since 2023vs Right .245 312 69 24 68 16 2 6
2025vs Left .197 78 12 8 13 6 1 0
2025vs Right .273 103 16 11 24 6 0 1
2024vs Left .343 116 23 11 35 6 0 8
2024vs Right .240 201 51 13 44 10 2 5
2023vs Left .286 7 1 0 2 0 0 0
2023vs Right .000 8 2 0 0 0 0 0
Stat Review
How does Blas Castano 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
0.50
 
K/9
3.0
 
BB/9
6.0
 
HR/9
3.0
 
Fastball
0.0 mph
 
ERA
9.00
 
WHIP
2.00
 
BABIP
.287
 
GB/FB
0.60
 
Left On Base
65.2%
 
Exit Velocity
0.0 mph
 
Barrels/BBE
0.0%
 
Spin Rate
0 rpm
 
Balls Hit 95+ MPH
0.0%
 
Swinging Strike
2.0%
 
Advanced Pitching Stats
Loading Advanced Pitching Stats...
Defensive Stats
Loading MLB Defensive Stats...
Stats Vs Today's Lineup
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
More Fantasy News
Call-up official
PSeattle Mariners  AAA
May 23, 2025
The Mariners recalled Castano from Triple-A Tacoma on Friday.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Set to receive promotion
PSeattle Mariners  AAA
May 23, 2025
The Mariners will recall Castano from Triple-A Tacoma prior to Friday's game in Houston, Francys Romero of BeisbolFR.com reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Optioned to Triple-A
PSeattle Mariners  AAA
March 7, 2025
The Mariners optioned Castano to Triple-A Tacoma on Friday.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Added to 40-man roster
PSeattle Mariners  AAA
November 4, 2024
The Mariners selected Castano's contract from Triple-A Tacoma on Monday, Francys Romero of BeisbolFR.com reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.