News Mariners Team Notes

[Seattle Mariners]

Mariners To Select Luis F. Castillo

The Mariners plan to select right-hander Luis F. Castillo to start tomorrow evening’s game against the Giants, the club informed reporters (including Adam Jude of The Seattle Times). As Jude notes, it’ll be the second straight Mariners game started by a Luis Castillo. Seattle’s veteran right-hander of the same name tossed seven innings in yesterday’s win over Detroit.

Luis F. Castillo will be making his first major league start. The 30-year-old has three MLB relief appearances under his belt. Those came with the 2022 Tigers, for whom he tossed 3 2/3 scoreless innings with four strikeouts. Detroit sent him through outright waivers at the end of that season. Castillo signed with the Chiba Lotte Marines of Japan’s Nippon Professional Baseball the following offseason.

After turning in a 3.12 ERA across 49 innings for the Marines, Castillo moved to the Orix Buffaloes. He fired 94 1/3 innings of 2.96 ERA ball despite a pedestrian 19.6% strikeout rate. Castillo showed fantastic control, though, walking fewer than 5% of batters faced for the second consecutive season. The Dominican-born pitcher returned to the affiliated ranks last offseason, joining the Mariners on a minor league contract in January.

Castillo pitched five innings of three-run ball across three appearances in Spring Training. He worked 5 2/3 frames in his first Triple-A start on Sunday, allowing one run on two hits and a pair of walks. Seattle will bring him up for at least a spot start as the fifth spot in their rotation comes around. Emerson Hancock got that job out of Spring Training because of the George Kirby injury, but the former sixth overall pick couldn’t escape the first inning in his season debut. Seattle optioned him out a few days later.

The Mariners announced this afternoon that they reinstated Jorge Polanco from the paternity list. They optioned Leo Rivas and swingman Jhonathan Díaz to Triple-A Tacoma. Castillo will take Díaz’s active roster spot. The 40-man roster is at capacity, so they’ll need to make another move in that regard tomorrow.

Source: https://www.mlbtraderumors.com/2025/04/mariners-to-select-luis-f-castillo.html

 

[Seattle Mariners]

Mariners Designate Hagen Danner For Assignment

The Mariners announced that right-hander Hagen Danner has been designated for assignment. That opens a 40-man spot for Luis F. Castillo. It was reported yesterday that Castillo would be coming up to start today’s game, making for an odd bit of trivia as the other Luis Castillo started the prior game for the M’s. An active roster spot was already opened by optioning left-hander Jhonathan Díaz yesterday.

Danner, 26, hasn’t been with the Mariners for long. He was claimed off waivers from the Blue Jays in January. He then tossed 3 1/3 innings in the Cactus League, allowing five earned runs. He was then sent to Triple-A Tacoma and started his season with 2 2/3 scoreless innings there.

His overall track record as a pitcher isn’t terribly long. The Jays drafted him as a catcher and tried him at that spot for a few years, but his bat didn’t pan out and they moved him to the mound. He has since put up some decent numbers on a rate basis but with occasional injury absences. Due to those health issues, he still hasn’t thrown 40 innings in any one season.

He has one third of an inning in the majors, which was back in 2023, and then 116 2/3 minor league innings from 2021 to the present. In that minor league work, he has a 2.93 earned run average, 28.3% strikeout rate and 8.7% walk rate.

The M’s will now have a week of DFA limbo to figure out what’s next. The waiver process takes 48 hours, so any trade interest would have to be gauged in the next five days. Danner still has an option, so he could be stashed in the minors by any club willing to give him a 40-man spot. If he were to pass through waivers unclaimed, the Mariners could hold onto him as some non-roster depth.

Photo courtesy of Mark J. Rebilas, Imagn Images

Source: https://www.mlbtraderumors.com/2025/04/mariners-designate-hagen-danner-for-assignment.html