Washburn will make his first start in more than a month as the Angels continue their three-game series against the Cleveland Indians at Jacobs Field.
Anaheim needs its pitching to step up over the next four weeks for them to make the playoffs. The Angels are four games behind Oakland for first place in the AL West, and they trail Boston by 4 1/2 games for the AL wild card.
Washburn will make his first start Saturday since allowing 10 runs, including four homers, in a 14-5 loss to Cleveland on July 20.
“I feel good,” said Washburn, who made 75 pitches in a Class-A rehabilitation start last week.
The left-hander, who has been on the disabled list with a chest injury, is 10-5 with a 4.83 ERA.
Anaheim third baseman Troy Glaus homered for the first time since May 11, and Garret Anderson and Bengie Molina also hit home runs to power the Angels past the Indians 10-5 Friday and snap a three-game losing streak.
Glaus was playing in his fifth game since missing three months because of surgery on his right shoulder.
Anderson homered in the fifth and went 3-for-4 with three RBIs for the Angels, who won for the 11th time in 15 games. Cleveland has lost 14 of 18.
Travis Hafner hit a two-run homer in the sixth, his 25th of the year for the Indians. He went 2-for-4 and is hitting .636 (14-for-22) with seven homers and 16 RBIs against Anaheim this season.
The loss dropped Cleveland into third place in the AL Central, 10 games behind first place Minnesota.
The Indians will send out right-hander Jason Davis to pitch on Saturday. Davis will make his first start since being sent to Triple-A Buffalo on July 11.
“I know I wasn’t pitching the way I could,” said Davis, who was 2-6 with a 6.00 ERA in 18 starts earlier this season with the Indians. Davis went 3-2 with a 3.00 ERA at Buffalo and said he feels much more comfortable after making some adjustments in his delivery.