Canada's Bianca Andreescu rose 10 positions to a career-best No. 5 in the WTA Tour women's singles world rankings on Monday after winning the U.S. Open title for the first time.
Andreescu defeated Serena Williams 6-3, 7-5 on Saturday to become the first Canadian to win a Grand Slam singles championship.
The 19-year-old from Mississauga, Ont., was seeded 15th at the tournament. Andreescu, who earned US$3.85 million for the victory, was ranked No. 152 in the world at the end of 2018.
Ashleigh Barty of Australia moved up one spot to No. 1 on the new list while Japan's Naomi Osaka fell three positions to No. 4. Ukraine's Elina Svitolina jumped two positions to No. 3.
Williams, who has won 23 career Grand Slam singles titles, fell one spot to No. 9. The rest of the top 10 included No. 6 Simon Halep of Romania (down two positions), No. 7 Petra Kvitova (down one), Kiki Bertens of the Netherlands (down one) and Switzerland's Belinda Bencic (up two).
Andreescu and Eugenie Bouchard of Westmount, Que., are the only Canadians to crack the top five on the WTA Tour list.
Bouchard, who reached the No. 5 position in October 2014, fell 32 spots to No. 151 this week.
In the men's ATP Tour rankings, Felix Auger-Aliassime of Montreal dropped two positions to No. 21. Milos Raonic of Thornhill, Ont., fell two spots to No. 24 and Denis Shapovalov of Richmond Hill, Ont., held steady at No. 33.
Raonic reached a career-high No. 3 in November 2016.
