Hideki Matsuyama rode a hot putter to a record score at Medinah, making five birdie putts from 15 feet or longer for a nine-under 63 that gave him a one-shot lead going into the weekend at the BMW Championship.
He also took a big step toward keeping alive his streak of playing the Tour Championship every year since he turned pro.
Matsuyama started and ended his round with a 30-foot birdie putt, the last one giving him the 36-hole lead over Patrick Cantlay (67) and Tony Finau (66). Justin Thomas recovered from three bogeys for a 69 and was two shots behind.
Tiger Woods made back-to-back bogeys late in his round just when he was getting some momentum. He had to settle for a 71 and was 10 shots behind.
Canada’s Adam Hadwin, who shot a second-round 68, is sitting three back, in a tie for fifth with five others.