ARLINGTON -- Yu Darvish was scratched from his start Thursday against the Twins with tightness in his right quad. His next start will come next Tuesday against the Rays.

Roy Oswalt will take Darvish's place, making his second spot start of the season. Darvish began experiencing the tightness after his bullpen session on Tuesday and was throwing on the field on Wednesday afternoon without any issues. Tuesday's game will mark his first career outing against the Rays.

"I just felt a little tightness in my quad during my bullpen yesterday," Darvish said in a statement. "I don't look at it like an injury, just a precaution. It's just a small problem now. I want to handle it before it becomes a big problem. I talked it over with the coaches, and this is the best decision for me and the team going forward."

Darvish is 12-9 with a 4.51 ERA in 23 starts this year and has gone 2-2 with a 6.60 ERA in seven starts since the All-Star break. The only other time he missed a start this season was right before the All-Star break, when manager Ron Washington wanted to give him some extra rest. Entering Wednesday with a five-game lead in the American League West and 39 games left in the regular season, Washington did not want to take any chances with Darvish's health.

"It was a no-brainer," Washington said. "He's always had a little tightness, and then his trainer would get it out. We just decided we weren't going to take any chances. He's not injured. He'll be ready for his next start."