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Paris - Rafael Nadal reclaimed top spot in the men's ATP rankings on Monday after Swiss rival and defending champion Roger Federer crashed out early in Miami.
Nadal, who hasn't hit a ball in anger since pulling out of the Australian Open quarter-finals in January, saw Federer take over top spot on February 18.
The Swiss veteran, however, slipped 10 points behind his Spanish rival and into second place after a second round defeat to Thanasi Kokkinakis. Towering American John Isner leapt eight places to ninth thanks to his eventual victory Sunday in the Masters 1000 event.
Isner thus equals his previous best ranking of ninth, reached in April 2012, while beaten finalist Alexander Zverev of Germany moved up one place to fourth.
South Korea's Hyeon Chung meanwhile continued to chip away at the rankings, the 21-year-old breaking into the top 20, to 19th, for the first time in his fledgling career thanks to his quarter-final appearance in Miami.
Top 20 in the latest ATP Tour rankings:
1. Rafael Nadal (ESP) 8 770
2. Roger Federer (SUI) 8 670
3. Marin Cilic (CRO) 4 985
4. Alexander Zverev (GER) 4 925
5. Grigor Dimitrov (BUL) 4 635
6. Juan Martin Del Potro (ARG) 4 470
7. Dominic Thiem (AUT) 3 665
8. Kevin Anderson (RSA) 3 390
9. John Isner (USA) 3 125
10. David Goffin (BEL) 3 110
11. Lucas Pouille (FRA) 2 410
12. Pablo Carreno (ESP) 2 395
13. Novak Djokovic (SRB) 2 310
14. Sam Querrey (USA) 2 265
15. Diego Schwartzman (ARG) 2 20
16. Jack Sock (USA) 2 200
17. Roberto Bautista (ESP) 2 175
18. Tomas Berdych (CZE) 2 140
19. Hyeon Chung (KOR) 1 897
20. Fabio Fognini (ITA) 1 840
