Phil Mickelson, looking ageless, leads Brooks Koepka, looking dangerous, at PGA Championship

KIAWAH ISLAND, S.C. — For a while, it looked like a Saturday somebody ought to paint. Phil Mickelson, 25 days shy of 51, made the turn, blasted one 310 yards into the fairway at No. 10, knocked one to seven feet, made the putt for a birdie and led by five holy-mercy strokes over a field chockablock with whippersnappers. Roars ricocheted around the green, the truth impossible, the Ocean Course like some dreamscape.