"What a birthday outing," said League. "I got all my pitches in, that's for sure."
League, whose ERA soared to 16.20, allowed a leadoff homer to David Murphy, who smoked starter Clayton Kershaw in the left Achilles with a comebacker in his previous at-bat. League said he felt his mechanics were inconsistent.
"Nothing major," League said. "I'll look at the video and see what I'm doing. I felt inconsistent staying back, leaking out front, especially with runners on base.
"Up until this outing, I've felt pretty consistent. You get out of whack sometimes, right?"
Manager Don Mattingly said he wasn't concerned over one outing, hoping League "got that out of his system." He's allowed nine hits in 3 1/3 innings.
League comes into this season as the team closer off his solid turnaround after being acquired last summer from Seattle. He is backed up by Kenley Jansen and Ronald Belisario, the former having just left for the World Baseball Classic and Team Netherlands, the latter having just returned from Team Venezuela.
League was followed to the mound by J.P. Howell, who pitched a scoreless inning, then Javy Guerra, who struck out both batters he faced in his first action since missing a few days with a sore right groin.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.