ANAHEIM -- Angels right-hander Garrett Richards left Monday's 8-4 loss to the Texas Rangers with a right groin strain. After the contest, manager Mike Scioscia said the rookie would be reevaluated on Tuesday.

"He is sore right now," Scioscia said. "We'll probably have to make some pending moves tomorrow to get some pitching up here."

Scioscia and an Angels trainer came out to the mound with two outs in the first inning when Richards winced after throwing a 1-2 fastball to Nelson Cruz that was hit foul.

"I felt like I had my good stuff, so it is unfortunate," Richards said. "It just kind of came on."

He said he felt some discomfort before throwing his final pitch, but wanted to see if he could work through it. It's the first time in Richards' career that he has dealt with a groin injury.

"I knew what kind of position we were in and my job is to go out there and give us a chance to win, so that's what I was trying to do tonight," Richards said. "I just felt it and knew I had to come out."

Bobby Cassevah replaced Richards, who was making his second Major League start, with the Angels trailing, 1-0, and ended the inning with one pitch.

In his Major League debut on Wednesday against the Yankees, Richards tossed five innings, giving up six runs on six hits for the loss.

In two-thirds of an inning Monday, Richards gave up an unearned run on two hits. He threw 19 pitches.

"He looked good in the bullpen and the ball was coming out well," catcher Bobby Wilson said. "You never wanna see a guy get hurt."

"His stuff looked great," Scioscia said. "If he gets out of that first inning, who knows how far it goes. Much crisper than in New York. He had a tighter slider. It's disappointing not seeing that play out."