"It's not like it was [last year]," Moreland said. "But it got a little stiff in an important part of the game. It was a big run and we were trying to be safe with it."
Moreland, with the score 1-1, injured the leg running the bases on a leadoff double into the right-field corner. He immediately came out of the game for pinch-runner Jeff Baker.
"Anytime you get hurt in a game, it doesn't sound good," manager Ron Washington said. "We'll just see how it is tomorrow."
Baker and Lance Berkman could play first base if Moreland is out for only a few days and doesn't need to go on the disabled list. If he does, the Rangers may consider bringing up Mike Olt from Triple-A Round Rock, even though he has been active less than a week after missing a month with blurred vision.
Moreland missed 31 games last season with a strained left hamstring, and was on the DL from June 20-July 29. He entered the night hitting .282 with 12 home runs and 29 RBIs in 57 games.
T.R. Sullivan is a reporter for MLB.com. Read his blog, Postcards from Elysian Fields, and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.