Right-hander Yu Darvish has been placed on the 15-day disabled list by the Texas Rangers and will miss the All-Star Game next week.
Darvish has a mild strain in his upper back. The move was announced Wednesday and is retroactive to July 6.
Darvish was scheduled to pitch against Baltimore on Thursday, but has been scratched. He's 8-4 overall, but has won only once in his last nine starts.
Darvish leads the majors with 157 strikeouts. He has a 3.02 ERA.
Rangers assistant general manager Thad Levine says, "At this stage, it's not something we are really worried about." He says the injury "was a little more fatigue than anything."
In a statement, Darvish said, "I don't think it's a big issue, but just as a precaution, I'd rather skip a start than push it through."
Darvish will fly back to Dallas on Thursday for further evaluation.