ARLINGTON -- There was a reason right-hander Wilton Lopez didn't see any action during the Astros' series in San Francisco this week.
Lopez, who's among the most used relievers in the National League, went on the 15-day disabled list Friday with a sprained right elbow. He flew to Houston from San Francisco and was examined Thursday by team doctors, who determined he needed some rest.
Houston activated left-hander Fernando Abad, giving manager Brad Mills three lefties in the bullpen.
The workhorse Lopez was 3-0 with a 2.51 ERA in 32 games for the Astros.
"It was really unfortunate," Mills said. "He threw Sunday [in Chicago] and felt fine and came out Tuesday and felt a little tenderness. After getting him checked out, we felt it would be best to give him some rest."
Abad had been on the DL since May 26 with a right intercostal strain. He'll join Xavier Cedeno and Wesley
Wright as the lefties in an eight-man bullpen.
"We want to get him back to like he was throwing the ball earlier in the year," Mills said.