Hudson Valley Renegades pitcher Blas Castano throws during a game against the Brooklyn Cyclones on July 27, 2022, at Dutchess Stadium. Frank Becerra Jr. / The Journal News / USA TODAY NETWORK

Seattle Mariners Add Intriguing Pitcher to 40-Man Roster in Monday Move

Originally posted on Seattle Mariners on SI
By Teren Kowatsch | Last updated Nov 5, 2024 12:15 PM ET

The Seattle Mariners 40-man roster is now completely full.

Monday marked the deadline for several different kinds of transactions for MLB teams. It was the deadline for players or teams to exercise options, for teams to extend qualifying offers to eligible players and for clubs to activate players off the 60-day injured list and put them on the 40-man roster.

The Mariners had two of the three transactions happen on Monday.

Seattle had no outgoing free agents eligible to receive a qualifying offer, meaning the only transactions that had to get done were activating three players (Sam Haggerty, Matt Brash, Jackson Kowar) off the injured list and waiting to find out if outfielder Mitch Haniger invoked his $17.5 million player option.

Aside from a confusing few hours where there was no confirmation over whether Haniger exercised his player option after the 2 p.m. PT deadline, there was hardly anything unexpected to come out of Monday for the Mariners.

Except for one thing.

Seattle selected the contract of 26-year old pitcher Blas Castano from the team's Triple-A affiliate on Monday. Castano's addition with Kowar, Haniger, Brash and Haggerty filled out the team's 40-man roster.

Francys Romero originally reported the roster move.

Sources: Dominican RHP Blas Castaño (26) was added to the Seattle Mariners' 40-man roster.

Castaño, 26, finished 2024 in Tacoma, Triple-A, and was eligible for the Rule 5 Draft in December.
— Francys Romero (@francysromeroFR) November 4, 2024

Castano played 29 games for the Rainiers and Double-A affiliate Arkansas Travelers in 2024 and started 26 games. He posted a 4.38 ERA with 108 strikeouts in 125.1 innings pitched.

Per @francysromeroFR, RHP Blas Castaño (26 years old) was added to the Seattle Mariners' 40-man roster.

Castaño, 26, finished 2024 in Tacoma and had a 5-8 record with a 4.38 ERA and 108 K’s in 125.1 IP. pic.twitter.com/ed2DqaX68u
— EastCoastM’s (@EastCoastMs_) November 4, 2024

Castano was originally signed by the New York Yankees as an international free agent out of the Dominican Republic on June 1, 2018. He was released by the organization on Aug. 8, 2023, and signed by the Mariners on Aug. 11, 2023.

Castano is an interesting choice for the 40-man roster, especially considering he's been used mostly as a starting pitcher since joining Seattle's organization. Given the Mariners' elite starting rotation, that might indicate the team wanting to get a look at Castano in spring training. It could also show that the team foresees Castano being used as reliever in the future.

It also could have been a way for the team to avoid Castano being available in the December Rule 5 draft.

Regardless of the reasoning, it likely won't be too long before Seattle fans get a good look at Castano.

This article first appeared on Seattle Mariners on SI and was syndicated with permission.

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