Castillo will start Sunday's game against the Twins, Daniel Kramer of MLB.com reports.
Castillo was initially projected to start Tuesday at Baltimore but with Bryan Woo (hamstring) hitting the IL, Castillo will pitch Sunday on regular rest. The 31-year-old has surrendered four or more runs in three of his last four starts but owns a 3.79 ERA over 99.2 innings on the year.
Castillo (6-9) took the loss against the Rays on Tuesday, allowing four runs on five hits and four walks with four strikeouts over 5.1 innings.
Castillo surrendered a leadoff home run to Yandy Diaz in the first inning and an RBI single to Jose Siri in the second. He responded with three scoreless frames but was pulled after walking two batters in the sixth. Both baserunners scored, resulting in the third time Castillo has yielded at least four earned runs in June. The 31-year-old owns a 3.79 ERA, 1.21 WHIP and 100:30 K:BB over 99.2 innings this season and lines up to face the Orioles next week.
Mariners' Luis Castillo: Allows five earned runs in loss
Rotowire
Castillo (6-8) suffered the loss Thursday, allowing five runs on eight hits and two walks over five innings against the Guardians. He struck out four.
Castillo entered the fifth with a 3-2 lead, but with two outs a walk preceded a home run by Andres Gimenez, then another walk paved the way for a Josh Naylor double that saddled Castillo with five runs allowed and left him on the hook for the loss. Following Castillo's start June 2, he was on a 10-game stretch of allowing no more than two earned runs. However, his last three starts have been more of a mixed bag, as he's allowed 12 earned runs over his last 16 innings (6.75 ERA) including five runs allowed in two of his last three starts. He'll look to put things back together during his next start, scheduled to take place next week when the Mariners travel to Tampa to take on the Rays.
Castillo (6-7) allowed two runs on four hits and a walk while striking out seven over six innings to earn the win over the Rangers on Friday.
Castillo received an extra day of rest after Emerson Hancock got a spot start Thursday. It looks like that was a good move, as Castillo was able to bounce back from his worst start of the year to earn his third quality start in his last four outings. He is now at a 3.32 ERA, 1.14 WHIP and 92:24 K:BB over 89.1 innings through 15 starts. He's projected for a challenging road matchup versus the Guardians next week.
Castillo's next start has been pushed back a day to Friday against the Rangers, Ryan Divish of The Seattle Times reports.
The Mariners have just one off day over the next two weeks and one member of their rotation, Bryan Woo (forearm), who is banged up, so the team will use this as an opportunity to give their regular starters some rest. Emerson Hancock will draw the start Thursday versus the White Sox while everyone else gets bumped back.
