CAMBRIDGE, Ontario — Chella Choi ended up on top of the Manulife Classic leaderboard Thursday at windy Whistle Bear when Belen Mozo unraveled with a closing triple bogey. Choi shot 6-under 66, finishing with birdie on the par-5 ninth. "A lot of wind," said Choi, the South Korean player who won the Marathon Classic winner last year for her first LPGA Tour title. "But my game is good and driving is good, shot was good, so I made a lot of birdies." Mozo was 7 under before running into trouble on the par-4 18th. The Spaniard finished with 68. Second-ranked Ariya Jutanugarn was four back after 70 in her bid to win three straight events for the second time this season.PGA EUROPE: Masters champion Danny Willett of England shot 5-under 65, one shot behind joint leaders Paul Peterson of the United States, Frenchmen Gregory Havret and Mike Lorenzo-Vera, and Daniel Brooks of England at the European Masters in Crans-Montana, Switzerland. MAJOR HURT: British Open champ Henrik Stenson shot the lowest score in major championship history with a slight cartilage tear in his right knee. Stenson said tests revealed the injury that dates to the U.S. Open in June. He won the British Open in July by closing with 63 to hold off Phil Mickelson and set the scoring record at majors with 264.