A lengthy video session convinced reliever Tom Wilhelmsen that he has caused his recent problems by tipping off pitches, particularly the fastball.

Wilhelmsen on Friday allowed two homers and five runs for the second time with the Rangers. A year ago with Seattle, he allowed only three homers in 62 innings.

"I've never seen groups of guys take monstrous hacks off my heater," Wilhelmsen said. "That's because they know it's coming."

Wilhelmsen did not say at what point in his delivery that opponents have picked up the pitches. He said identifying the problem is the first step toward a solution.