Blas Castano

26-Year-Old PitcherP

Seattle Mariners AAA

2025 Stats

W-L

0-0

ERA

0.00

WHIP

0.00

Rest-of-Season Projections

W-L

ERA

WHIP

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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

League AAA

Bats R

Throws R

40 Man Yes

Height 5'11"

Weight 150

DOB 9/8/1998

Drafted 2018

Optioned to Triple-A

PSeattle Mariners AAA

March 7, 2025

The Mariners optioned Castano to Triple-A Tacoma on Friday.

ANALYSIS
Castano was added to the Mariners' 40-man roster in November, but he'll head back to Triple-A to begin 2025 after allowing five runs (four earned) over two innings during spring training. The 26-year-old righty turned in a 5.13 ERA and 1.41 WHIP with the Rainiers last season, and he'll likely need to improve upon those numbers before getting a chance in Seattle's rotation.

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