LA QUINTA, Calif. — Si Woo Kim birdied two of the final three holes to finish a rock-solid, 8-under 64, coolly rallying past late-charging Patrick Cantlay by one shot to win The American Express on Sunday for his third PGA Tour victory.

The 25-year-old South Korean didn’t flinch when Cantlay shot a 61 and surged out of 13th place to the front while breaking the Stadium Course record by two strokes.