The Mariners announced that they’ve traded righty Luis F. Castillo to Baltimore for cash. Seattle had designated him for assignment yesterday as the corresponding move for the Leody Taveras waiver claim. Baltimore optioned Castillo to Triple-A Norfolk and designated lefty Walter Pennington for assignment to create a 40-man roster spot.
Castillo, the now-former teammate of the Seattle All-Star starter of the same name, has five major league appearances under his belt. He signed a minor league deal over the offseason and was selected onto the big league roster in early April. Castillo took a pair of turns through the rotation. He surrendered seven runs (six earned) on 12 hits and seven walks across seven innings. He struck out five.
Those were Castillo’s first two major league starts. His previous big league experience consisted of a trio of relief outings for the Tigers in 2022. Castillo spent the next two seasons in Japan. He didn’t miss many bats but managed a 2.96 ERA over 94 1/3 innings for the Orix Buffaloes a year ago. The 30-year-old has made four starts for Seattle’s top farm team in Tacoma. He has managed a 12:5 strikeout-to-walk ratio while surrendering eight runs through 14 1/3 frames.
Castillo sits in the 91-92 MPH range with both his four-seam fastball and sinker. There’s not much swing-and-miss upside but he has a full slate of minor league options. He’ll join Brandon Young and Chayce McDermott as depth starters who are on optional assignment to Norfolk.
Pennington, 27, heads back into DFA limbo for the second time in as many weeks. He was designated for assignment and released by the Rangers at the end of April. Baltimore grabbed him off release waivers. He made one appearance apiece at High-A Aberdeen and with Norfolk. Pennington hasn’t been able to find the strike zone, walking six of 10 batters faced while allowing seven runs (five earned) in one combined inning.
Initially drafted by the Royals, Pennington was traded to Texas last summer in the Michael Lorenzen deadline deal. He’s only a season removed from posting a 2.13 ERA with a 32.2% strikeout rate over 63 1/3 Triple-A innings. Pennington had been pitching at the Rangers’ complex before they moved on, and his pair of appearances with Baltimore affiliates were clearly alarming. He’ll likely wind up back on waivers in the next few days. If he goes unclaimed, he would not have the requisite service time to decline an outright assignment.