Guerra allowed three runs on four hits and two walks while striking out one over one-plus inning Thursday versus the White Sox.
Angels starter Alex Cobb gave the team five scoreless frames, but Guerra followed by surrendering a run in the sixth. He came back out for the seventh inning and allowed three straight hitters to reach base before he was pulled. Guerra threw only 16 of 33 pitches for strikes and has issued 10 free passes over his past 11.2 innings. The right-hander has posted a troubling 6.06 ERA and 1.73 WHIP overall this season.