Rafael Nadal and Serena Williams remain at the top in the men’s and women’s tennis rankings issued on Monday by the ATP and the WTA.

Nadal has 13,730 points and Novak Djokovic is close behind on 11,680. Australian Open champion Stansilas Wawrinka of Switzerland is third on 5,760.

Richard Gasquet climbed from 11 to 10 at the expense of Milos Raonic.

Williams leads despite Charlestone upset

Williams has 12,375 points in the women’s rankings, and is almost 5,000 clear of second-placed Australian Open champion Li Na — who has 7,585. Agnieszka Radwanska of Poland is third on 5,980.

She retained a healthy lead despite an unfamiliar early exit in Charlestone last week, losing to unseeded Slovak Jana Cepelova at the clay-court event.

ATP top 10 as of April 7 (previous ranking in parenthesis): 1. (1) Rafael Nadal, Spain, 13,730 points 2. (2) Novak Djokovic, Serbia, 11,680 3. (3) Stanislas Wawrinka, Switzerland, 5,760 4. (4) Roger Federer, Switzerland, 5,355 5. (5) Tomas Berdych, Czech Republic, 4,720 6. (6) David Ferrer, Spain, 4,640 7. (7) Juan Martin del Potro, Argentina, 4,260 8. (8) Andy Murray, Britain, 4,040 9. (9) John Isner, United States, 2,715 10. (10) Richard Gasquet, France, 2,635

WTA top 10 as of April 7 (previous ranking in parenthesis): 1. (1) Serena Williams, United States, 12,375 points 2. (2) Li Na, China, 7,585 3. (3) Agnieszka Radwanska, Poland, 5,980 4. (4) Victoria Azarenka, Belarus, 5,441 5. (5) Simona Halep, Romania, 4,695 6. (6) Petra Kvitova, Czech Republic, 4,370 7. (7) Angelique Kerber, Germany, 4,110 8. (9) Maria Sharapova, Russia, 3,961 9. (8) Jelena Jankovic, Serbia, 3,955 10. (10) Dominika Cibulkova, Slovakia, 3,720

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