London - Jason Day has regained the world No 1 spot following his win in the World Match Play tournament in Texas on Sunday.
The 28-year-old Australian defeated South Africa's Louis Oosthuizen 5 and 4 in the final in Austin to record superb back-to-back wins, having triumphed in the Arnold Palmer Invitational the previous week.
Day takes over at the top from Jordan Spieth, who lost in the round of 16 in the Match Play. The 22-year-old American had been at the top since winning the Tour Championship at the end of September and moving ahead of Day.
"I'm very, very thrilled. It's been a memorable week this week not only to win the Dell Match Play Championship but also to get back to No 1 in the world," Day said.
Rory McIlroy, who lost in the semi-finals to Day in Austin, stays at No 3 with the first of the year's four majors, the Masters, fast approaching in two weeks' time.
Spieth will be the defending champion at Augusta National, Day will be looking for back-to-back major wins and McIlroy will be out to complete a career Grand Slam.
Oosthuizen, meanwhile, climbed seven spots to No 11 in the rankings, with compatriot Branden Grace moving down one spot to No 13.
World top 20
1. Jason Day (AUS) 12.53 pts (+1)
2. Jordan Spieth (USA) 11.06 (-1)
3. Rory McIlroy (NIR) 9.36
4. Bubba Watson (USA) 8.68
5. Rickie Fowler (USA) 7.86
6. Adam Scott (AUS) 7.26
7. Henrik Stenson (SWE) 7.18
8. Justin Rose (ENG) 6.07
9. Dustin Johnson (USA) 5.94
10. Patrick Reed (USA) 5.00
11. Louis Oosthuizen (RSA) 4.83 (+7)
12. Danny Willett (ENG) 4.65 (-1)
13. Branden Grace (RSA) 4.65 (-1)
14. Hideki Matsuyama (JPN) 4.59 (-1)
15. Sergio Garcia (ESP) 4.40 (-1)
16. Zach Johnson (USA) 4.23 (-1)
17. Brandt Snedeker (USA) 4.18
18. Brooks Koepka (USA) 4.09 (+2)
19. Jim Furyk (USA) 4.01 (-3)
20. Phil Mickelson (USA) 3.97 (-1)