Day wound up tied for sixth at the tournament, which was enough to lift him past Jason Dufner for the No. 10 spot in the rankings. Dufner drops to 11th.
Rory McIlroy won the tournament for his first title of the calendar year. He shot 6-under-par 66 Sunday to outduel Adam Scott for a one-stroke win. McIlroy dropped a 12-foot birdie putt on the final hole where Scott had a bogey.
Scott was going for the Australian Triple Crown as he'd already claimed the Australian PGA and Australian Masters titles. He remains ranked second behind Tiger Woods and McIlroy, last year's year-end No. 1, is No. 6.
Charl Schwartzel won the European Tour's Alfred Dunhill Championship in South Africa. It was the third time Schwartzel won the event and he's been second four times. He goes from 21st to 18th in the world rankings.
Hideki Matsuyama, who started the year ranked No. 127th and turned professional in April, improves to 23rd after winning the Japan Golf Tour's Casio World Open. It was his fourth title of the year and made him the first rookie to win the Japan Tour money title.
Woods is No. 1 for a 658th week but Scott's Australian run has cut the margin between the two from 3.62 in rankings point average to 1.76 in the past month.
The men's world golf Top 10, listing player's name, home country and rankings points average:
1. Tiger Woods, United States, 11.89
2. Adam Scott, Australia, 10.13
3. Henrik Stenson, Sweden, 8.85
4. Phil Mickelson, United States, 7.57
5. Justin Rose, England, 7.50
6. Rory McIlroy, Northern Ireland, 6.86
7. Matt Kuchar, United States, 6.27
8. Steve Stricker, United States, 6.03
9. Brandt Snedeker, United States, 5.63
10. Jason Day, Australia, 5.41