FARMINGDALE, N.Y. -- What felt like a battle for Brooks Koepka looked like a runaway Friday in the PGA Championship.Koepka backed up his record-tying 63 with a round that put him in a league of his own. With three birdies in four-hole stretches to start and end his round, the defending champion posted a 5-under 65 that shattered the 36-hole score for a major championship.More important to Koepka was a seven-shot lead over Dallas' Jordan Spieth and Adam Scott going into the weekend.