Hamilton said he felt his back tighten up in the middle of the game. He mentioned it to manager Ron Washington after he wasn't able to run hard to first base on a ground ball in the eighth inning.
"It was tight and he told me not to go out there," Hamilton said. "I put some ice on it and it feels better. I've never had back spasms. I had spasms in my hip when I hurt it (last year), but not in my back. I expect to play."
Washington wasn't worried about his slugger after the Rangers extended their AL West lead to a season-high six games over the Angels.
"He looked fine high-fiving everybody as they came in the clubhouse," Washington said. "He'll be OK."
Hamilton had three hits in the game and was a triple short of the cycle. He hit an opposite-field home run in the third, his 15th of the season.
Hamilton was on the disabled list for nearly six weeks early in the season with a hairline fracture in a bone in his upper arm following a headfirst slide into home plate the second week of the season in Detroit.
The 2010 AL MVP is hitting .304 with 15 homers and 67 RBIs in 85 games.
Richard Durrett covers the Rangers for ESPNDallas.com.