Phil Mickelson Wins the P.G.A. Championship

Phil Mickelson reacting to his second shot on the sixth hole during the final round of the P.G.A. Championship.Credit...Stacy Revere/Getty ImagesKIAWAH ISLAND, S.C. — With a victory at the P.G.A. Championship on Sunday, Phil Mickelson, who will turn 51 next month, became the oldest golfer to win a major championship. The oldest previously was Julius Boros, who was 48 when he won the 1968 P.G.A. Championship.

Mickelson shot six under par for the tournament, finishing two strokes ahead of the runners-up, Brooks Koepka and Louis Oosthuizen.

It was Mickelson’s sixth major title, something only 14 male golfers have achieved. Mickelson was the seventh to reach that total since 1964. Mickelson has…