ST. LOUIS — Brooks Koepka is impossible to overlook now, winning the PGA Championship on Sunday with machine-like precision to go along with his back-to-back U.S. Open titles. And it still felt like he was the second billing to Tiger Woods. With roars for Woods unheard anywhere this side of Augusta National, Koepka kept his cool and ran off two birdies on the back nine at Bellerive right after Woods closed within one shot.