Former world No.1 Rafael Nadal has slipped two places while Andy Murray climbs to third in world rankings published on Monday.
The Spaniard, who pulled out of his quarter-final with Andy Murray at the Australian Open due to injury, has not been ranked outside the top three since before his first French Open victory in 2005.
Australia's Lleyton Hewitt is up three places to 19th.
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Britain's Murray lost to Roger Federer in the Melbourne decider but his run to the final sees him climb a place to third.
Serbia's Novak Djokovic was beaten by Frenchman Jo-Wilfried Tsonga in the last eight but he moves up to second, 510 points ahead of Murray.
Croatia's Marin Cilic, who reached his first ever Grand Slam semi-final at Melbourne Park, makes the top 10 for the first time in his career.
ATP world rankings:
1. Roger Federer (SUI) 11,350 points
2. Novak Djokovic (SRB) 8,310 (+1)
3. Andy Murray (GBR) 7,800 (+1)
4. Rafael Nadal (ESP) 7,670 (-2)
5. Juan Martin Del Potro (ARG) 6,400
6. Nikolay Davydenko (RUS) 5,290
7. Andy Roddick (USA) 4,150
8. Robin Soderling (SWE) 3,375
9. Jo-Wilfried Tsonga (FRA) 3,235 (+1)
10. Marin Cilic (CRO) 2,970 (+4)
11. Fernando Gonzalez (CHI) 2,870
12. Fernando Verdasco (ESP) 2,760 (-3)
13. Gael Monfils (FRA) 2,520 (-1)
14. Radek Stepanek (CZE) 2,445 (-1)
15. Tommy Robredo (ESP) 2,005 (+1)
16. Gilles Simon (FRA) 1,915 (-1)
17. Tommy Haas (GER) 1,855
18. David Ferrer (ESP) 1,780
19. Lleyton Hewitt (AUS) 1,770 (+3)
20. Mikhail Youzhny (RUS) 1,770
