The reigning U.S. Open and Australian Open champion took the top spot back from Australia's Ashleigh Barty, whose
round-of-32 loss in Canada dropped her back to No. 2.
Osaka regains No. 1 spot in world rankings
Naomi Osaka reacts to a point against Serena Williams during the Rogers Cup tennis tournament in Toronto, Canada, August 9 2019 Source: AAP Image/John E. Sokolowski-USA TODAY Sports/Sipa USA
Japan's Naomi Osaka regained the WTA world No. 1 ranking Monday following her quarterfinal run at last week's Rogers Cup in Toronto.
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