There may not be a team that has more players representing their respective organization in the 2026 World Baseball Classic than the Seattle Mariners.

When the 2026 WBC rosters were announced, the Mariners had a total of 16 players across the major and minor leagues representing 12 countries.

Shockingly, a major unit on the major league team that didn't have any players go to the WBC was the starting rotation.

The group of Logan Gilbert, Bryan Woo, George Kirby, Luis Castillo and Bryce Miller have a collective four All-Star selections over the last three seasons. Woo made his first career All-Star Game in '25.

However, every pitcher in the rotation with the exception of Castillo missed varying amounts of time last season due to respective injuries. It's unclear how many of them were asked to compete in the tournament. But it seems like the focus for this season was to go into and come out of spring training healthy and tackle 2026 full force.

However, one of those hurlers will be ready to go for his native country in the international tournament if needed.

Castillo, who represents the Dominican Republic, was among the players added to the designated pitcher pool for the WBC.

The designated pitcher pool offers as a reserve for teams if need be. After the first round or the quarterfinal round of the WBC, teams can pull from the pool and add those hurlers to their respective rosters if need be.

The WBC takes place from March 5-17. The quarterfinal begins March 13, marking that date as the earliest Castillo could be activated to the Dominican Republic's roster.

If Castillo were to be moved from the DPP to the Dominican Republic's roster, it would mark the first time he competes in the international tournament. He withdrew from the 2023 WBC after he signed a five-year, $108 million extension with Seattle.

Castillo was the only member of the M's starting rotation that didn't miss time due to injury last season. He posted a 3.54 ERA and struck out 162 batters in 180.2 innings pitched across 32 starts.

Castillo is the most experienced pitcher on the team's starting rotation. This upcoming season will be his 10th in the majors. He made his major league debut in 2017 with the Cincinnati Reds and was acquired by the Mariners in a trade July 30, 2022. He's made at least 30 starts each full season with Seattle from 2023-25.

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