KIAWAH ISLAND, S.C. — Weathering a riveting, roller-coaster test of nerve over five hours, Phil Mickelson, who turns 51 next month, won the P.G.A. Championship on Sunday to become the oldest golfer to win a major championship. The record was previously held by 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.

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