Perez gave up four runs on seven hits and two walks while striking out five in 5.1 innings Saturday against the Mariners.
Despite the shaky outing, he was able to pick up the win and improve to 3-6 on the season, as Yovani Gallardo was even less effective for Seattle. The 26-year-old southpaw now sports a 4.72 ERA and 1.64 WHIP through 14 starts, and his 16.8 percent strikeout rate ranks 67th among 84 qualified big-league starters. Despite Perez's struggles and the impending return of Cole Hamels (oblique) to the rotation, the Rangers still lack enough quality options for his rotation spot to be in jeopardy.