 The following season, Happ would post his worst career numbers, with a 6–15 record, a 5.35 ERA, 134 strikeouts, and a 1.54 WHIP in a career-high 156 innings pitched.On June 13, 2012, Happ was the opposing starting pitcher for Matt Cain's perfect game.Happ pitched 3 innings, gave up 11 hits, and 8 runs, all of which were earned runs.