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.