CLEARWATER, Fla. — It was mid-July last season, the final series before the All-Star break when Brad Keller and the Cubs went into Yankee Stadium.With his team up 5-0 in the bottom of the ninth, Keller faced all-world slugger Aaron Judge and the at-bat ended the way many do against Judge, with a deep flyball that sailed over the wall in right-center field for a two-run homer.It was one of a few moments that seemingly changed everything for the 30-year-old starter-turned-reliever.Keller allowed just one run in 28 appearances the rest of the way for a 0.33 ERA and 0.57 WHIP, in the process setting himself up as one of the most sought-after setup men in baseball.The Phillies signed him in mid-December to a two-year, $22 million contract.A small adjustment"I kind've struggled going into the All-Star break," Keller recalled Wednesday in the Phillies' clubhouse at BayCare Ballpark. "We had a game against the Yankees where I gave up a two-run homer to Judge.…