Australian Open champion Naomi Osaka has jumped to the top of women's tennis with her beaten opponent Petra Kvitova rising to second in Monday's WTA rankings.
Osaka climbed three places after beating the Czech in Melbourne on Saturday. Kvitova moved up four places.
The 21-year-old Japanese player has only won three career titles, but those include the last two majors, after she won the US Open in September.
Romanian former No 1 Simona Halep, knocked out by Serena Williams in the round of 16 in Melbourne, fell two spots to third. Dane Caroline Wozniacki, whose defence of her Australian Open title ended in the third round, fell six places to ninth.
The biggest rise of the week was by the 25-year-old American Danielle Collins who leaped 12 places to 23rd after her run to the semi-finals.
The other semi-finalist, Czech Karolina Pliskova, who saved four match points against Williams in their quarter-final, also advanced, gaining three places to fifth in the world.
Williams, who fell to 491 after her maternity break last year, continued her rise, gaining five places to 11th.
Meanwhile, Novak Djokovic strengthened his grip at the top of the ATP ranking following his destruction of Rafael Nadal in the Australian Open final.
An outclassed Nadal, beaten in straight sets in just over two hours, held on to second spot in the rankings while Roger Federer slipped from third to six place.
Defending champion Federer was eliminated in the round of 16 by Greek giant-killer Stefanos Tsitsipas.
Alexander Zverev replaces Federer in third position ahead of Juan Martin del Potro, fourth, who missed the Australian Open.
Despite his early elimination in Melbourne, South African Kevin Anderson, a Wimbledon finalist last year, moved up a spot into fifth.
Meanwhile, Japan's Kei Nishikori rises two places to seventh after reaching the quarter-finals in Melbourne.
Tsitsipas, eliminated by Nadal in the semi-finals, jumped three places and is knocking on the door of the top 10 in 12th place.
