Castillo (hamstring) will undergo an MRI on his left hamstring on Monday in Seattle, Daniel Kramer of MLB.com reports.
Castillo left Sunday's start against the Cardinals as a result of a left hamstring strain. He will now receive additional imaging on the leg to determine the severity of the injury. Manager Dan Wilson did not speculate if he believed that Castillo will be able to make his next scheduled start or not, but more information on Castillo's status will come Monday.
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Mariners' Luis Castillo: Departs with hamstring strain
Rotowire
Castillo was removed from Sunday's game against the Cardinals due to a left hamstring strain, Shannon Drayer of SeattleSports.com reports.
The right-hander had a good chance to pick up a win Sunday as Seattle scored seven runs across the first two frames, but Castillo was lifted due to the hamstring injury after giving up two runs across three innings. The severity of the issue isn't known, and it's unclear if the 31-year-old will be able to make his next turn through the rotation next weekend versus the Rangers.
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Mariners' Luis Castillo: Little run support Tuesday
Rotowire
Castillo did not factor into the decision in Tuesday's loss to the Athletics, allowing two runs on four hits and a walk while striking out five over seven innings.
Castillo only allowed four hits but two of them went for home runs, one by Lawrence Butler in the first inning and another by Seth Brown in the fourth. Castillo has now allowed nine home runs over his last five starts, though Tuesday was his first time reaching seven innings since July 19 and his first quality start since Aug. 11. The 31-year-old righty is putting together another strong campaign, yet the Mariners are 14-15 in his starts, partially due to the fact that they've scored two runs or fewer in 11 of Castillo's outings. For the year, he owns a 3.60 ERA, 1.15 WHIP and 172:46 K:BB in 172.1 innings and lines up to face the Cardinals in St. Louis over the weekend.
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Mariners' Luis Castillo: Solid in 11th win
Rotowire
Castillo (11-12) picked up the win Wednesday, giving up two runs on six hits and two walks over 5.2 innings in a 6-2 victory over the Rays. He struck out four.
The 31-year-old right-hander left the mound after 97 pitches (60 strikes) just short of his 18th quality start of the season, but it was still a respectable performance from Castillo. In eight starts since the All-Star break, he's posted a 3.94 ERA, 1.19 WHIP and 51:11 K:BB through 48 innings. Castillo will look to keep rolling in his next outing, which is scheduled to come on the road early next week in Oakland.
Mariners' Luis Castillo: Gives up three more homers
Rotowire
Castillo allowed five runs on six hits and struck out nine without walking a batter over six innings in a no-decision versus the Giants on Friday.
Castillo was in line for the loss until the Mariners rallied to tie the game in the eighth inning. He gave up a season-high three homers Friday, and the five runs against also matched his season high. He had allowed multiple homers just four times over his first 25 starts this year, but has now done so in back-to-back outings. Castillo is at a 3.66 ERA, 1.16 WHIP and 163:43 K:BB through 159.2 innings over 27 outings this year. He's projected for a home start versus the Rays next week.
Mariners' Luis Castillo: Allows two homers in loss
Rotowire
Castillo (10-12) took the loss against the Pirates on Saturday, allowing four runs on five hits and three walks with six strikeouts over 5.1 innings.
Castillo allowed four runs, including two homers, while generating 11 swinging strikes on 103 pitches. He broke a streak of seven consecutive quality starts and surrendered multiple home runs for the first time since June 20. On the season, the 31-year-old owns a 3.51 ERA, 1.17 WHIP and 154:43 K:BB across 153.2 innings and lines up for a home matchup with the Giants next week.
Mariners' Luis Castillo: Another dominant effort in win
Rotowire
Castillo (10-11) got the win over the Mets on Sunday, allowing one run on four hits and two walks while striking out nine over six innings.
Castillo was engaged in a pitcher's duel with Luis Severino heading into the fifth inning before the Mariners were able to provide him with some cushion on the scoreboard. The lone run against him came on a sixth-inning solo home run by Jeff McNeil. Castillo racked up nine strikeouts for a second straight start and went on a run in the game during which he struck out five consecutive batters. He's now recorded seven straight quality starts while allowing one or fewer runs four times. Castillo owns a 3.40 ERA, 1.16 WHIP and 148:40 K:BB in 148.1 innings and will look to keep rolling in a matchup with the Pirates over the weekend his next time on the mound.
Castillo (9-11) took the loss Tuesday against the Tigers, allowing three runs on eight hits and no walks while striking out nine over six innings.
Castillo kept the Tigers off the board until they plated the first run of the game in the fourth. Two more runs were scored against him in the fifth after the Tigers compiled four singles in the inning. It was the fourth time this season he's given up at least eight hits in a game, though only one hit went for extra bases. He also tied his season high in strikeouts and posted his sixth straight quality start. Castillo has been one of the most consistent pitchers in all of baseball this season, posting a 3.48 ERA, 1.17 WHIP and 139:38 K:BB in 142.1 innings this year. He lines up to face the Mets on Sunday to complete a two-start week.
Castillo (9-10) picked up the win Tuesday against Boston, allowing three runs on six hits and a walk across six innings. He struck out four.
Castillo delivered his fifth consecutive quality start and landed his third win during that stretch. All three runs attributed to Castillo came in the third inning when Rafael Devers lifted a three-run home run. While Castillo's K/9 has dropped from 10.0 to 8.6 this season, he's still been highly effective, posting a 3.43 ERA and 1.16 WHIP in 136.1 innings. He's tentatively lined up to make his next start Tuesday against the Tigers.
