ARLINGTON -- After three consecutive outings in which he threw more balls than strikes, left-handed reliever Jake Diekman went through a mechanical tuneup Saturday to slightly adjust his extreme cross-body delivery.

"I feel like the change I have to make is microscopic, really," Diekman said. "But I'm getting sore in places I shouldn't get sore. That's really how I know. I'm not a conventional pitcher with conventional mechanics. When something isn't right, I feel it in my body. It's not a big change, but something I've got to keep up on."

Diekman has allowed hitters a .350 on-base percentage and has a 4.82 ERA since Aug. 1. Over his last three appearances, he has thrown 22 balls and 16 strikes.

Briefly: C Jonathan Lucroy was scratched from Saturday's lineup with flu-like symptoms, but is expected to be back for Sunday's series finale.

-- RHP Yu Darvish, who starts the series finale Sunday, is 5-0 with a 3.00 ERA at Globe Life Park in Arlington this season. The Rangers have won each of Darvish's last five starts, regardless of location.

-- RHP Colby Lewis will pitch for short-season Class A Spokane at Everett in his final rehab outing Monday. Lewis is expected to make about 80 pitches in the game. It's a convenient assignment since the Rangers will be just down the road in Seattle.

Twitter: @Evan_P_Grant