Lee Westwood won the Indonesian Masters on Sunday to put himself in position move back to No. 1 in the world if Luke Donald fails to win the PGA Tour event in South Carolina.
Donald had a one-stroke lead entering the final round of The Heritage and would jump from No. 3 to No. 1 with a victory. Top-ranked Martin Kaymer took the week off.
After waiting out a lightning delay on the final hole, Westwood finished off a 3-under 69 for a three-stroke victory over Thailand's Thongchai Jaidee.
The English star, celebrating his 38th birthday Sunday, had a 19-under 269 total in the Asian Tour event at Royale Jakarta.
Jaidee shot a 65.