Winning for the first time since the 2012 U.S. Open, Simpson closed with a five-under-par 66 in the Shriners Hospitals for Children Open. He finished at 24-under 260 after opening with rounds of 64, 63 and 67 to take a four-stroke lead into the final round.
Ryo Ishikawa and Jason Bohn tied for second. Ishikawa, the Japanese player who had to play the Web.com Tour Finals to regain his PGA Tour card, shot a 65. Bohn had a 66.
Amy Yang made a 15-foot birdie putt on the first hole of a playoff with South Korean compatriot Hee Kyung Seo to win the KEB HanaBank Championship at Incheon, South Korea.
Yang won her first LPGA Tour title, finishing with a three-under 69 to match Seo at nine-under 207 on Sky 72 Golf Club's Ocean Course. Seo closed with a 68.
Michael Allen won the Greater Hickory Classic for his second Champions Tour title of the year and fifth overall, beating Olin Browne with a birdie on the first hole of a playoff at Conover, N.C.
Allen closed with a five-under 65, also birdieing the par-five 18th in regulation to match Browne at 13-under 197 at Rock Barn. Browne shot a 64, charging to the lead with seven birdies over a nine-hole stretch.
Second-round leader Bernhard Langer had a 69 to finish third at 11 under. He cut Kenny Perry's lead in the Charles Schwab Cup standings to 394 points with two events remaining.
Former top-ranked amateur Jin Jeong won the Perth International in Australia for his first professional victory, beating England's Ross Fisher with a par on the first hole of a playoff.
Jeong, the South Korean player who lives in Melbourne, closed with a three-under 69 to match Fisher at 10-under 278. Fisher finished with a 68.
Gasquet, Halep win in Kremlin Cup
Top-seeded Richard Gasquet of France won the 10th title of his career by rallying to beat qualifier Mikhail Kukushkin of Kazakhstan, 4-6, 6-4, 6-4, in the final of the Kremlin Cup at Moscow.
Simona Halep of Romania claimed the fifth title of her career by beating Samantha Stosur of Australia, 7-6 (1), 6-2, in the women's final.
Top-seeded Caroline Wozniacki of Denmark won her first tournament of the year, beating German teenager Annika Beck, 6-2, 6-2, in the final of the Luxembourg Open.