SUNDAY’S KEY HOLE

Hole: 10, Yardage: 447, Par: 4, Stroke Avg: 4.16.

Mickelson had a two-shot lead going to the back nine when he hit his approach to 12 feet for birdie. Brooks Koepka went from the left rough into a waste bunker and missed an 8-foot par putt. In the group ahead, Louis Oosthuizen hit his drive into a plugged lie in the sand and made bogey. That gave Mickelson a four-shot lead.