Clemens left Monday night’s game at Philadelphia after five innings with a strained right groin. The seven-time Cy Young Award winner is 6-4 with a 2.27 ERA in 15 starts this season.
“He’s just not ready to go,” manager Phil Garner said. “He still feels it.”
Garner said Clemens might be out for a week.
“There’s a good chance he won’t pitch until we get back home (on Friday),” Garner said. “Rocket knows very well how he feels.”
Hirsh (2-3, 6.84 ERA) allowed three runs—one earned—in six innings of last Saturday’s 4-2 loss to the New York Mets. The 24-year-old rookie right-hander, who is making his sixth career start, earned his first major league win at Miller Park on Aug. 17, allowing three runs in 5 1-3 innings of a 7-3 victory.
“Hopefully we can do that again—7-3 wouldn’t be a bad final,” said Hirsh, the Pacific Coast League Pitcher of the Year.
The Astros (69-71) have won nine of their last 12 games, including Friday’s 4-3 series-opening victory. Houston is in sixth place in the National League wild-card race, four games behind the San Diego Padres for the lead.
The Brewers, meanwhile, have dropped 12 of their last 14 games, all but mathematically ending their chances at a postseason berth. Corey Hart homered for Milwaukee, which got a scare when catcher Damian Miller was hit by a pitch in the head with the bases loaded in the seventh inning.
Miller laid motionless on the ground for a few minutes before walking off the field.
“I remember (Houston catcher Brad) Ausmus standing over me,” said Miller, who has a Grade 1 concussion. “He was pretty concerned.
“Right now I feel OK. It’s a little sore where I got hit.”
Tomo Ohka (4-4, 4.35) will take the mound for the Brewers on Saturday. He allowed three runs and eight hits in seven innings of Sunday’s 10-3 loss to Florida.
The Japanese-born right-hander had not lost since Aug. 8, going 1-0 with a 4.88 ERA in four starts between defeats.
Ohka is 1-3 with a 4.14 ERA in seven career starts against the Astros. He has not received a decision in three starts against them this season, despite posting a 1.93 ERA in those outings.