<p class="title">US and Australian Open champion Naomi Osaka returned to the world number one spot in the WTA rankings on Monday.</p>.<p class="bodytext">The 21-year-old lost to Serena Williams in the quarter-finals of last week's Rogers Cup but benefitted from the second-round defeat of former number one Ashleigh Barty and the failure of Karolina Pliskova to reach the semis in Toronto.</p>.<p class="bodytext">Osaka first hit top spot in January, after winning back-to-back majors in New York and Melbourne, making history as the first Japanese player to achieve it.</p>.<p class="bodytext">After seven weeks on top, Barty slips to second with Pliskova in third.</p>.<p class="bodytext">The only other movement in the top 10 sees Williams, a finalist in Toronto, climbing two places to eighth with Sloane Stephens going in the other direction.</p>.<p class="bodytext">Canadian Bianca Andreescu, who won the Rogers Cup following Williams' withdrawal with back spasms in the opening set of the final, climbs 13 places to 14.</p>
<p class="title">US and Australian Open champion Naomi Osaka returned to the world number one spot in the WTA rankings on Monday.</p>.<p class="bodytext">The 21-year-old lost to Serena Williams in the quarter-finals of last week's Rogers Cup but benefitted from the second-round defeat of former number one Ashleigh Barty and the failure of Karolina Pliskova to reach the semis in Toronto.</p>.<p class="bodytext">Osaka first hit top spot in January, after winning back-to-back majors in New York and Melbourne, making history as the first Japanese player to achieve it.</p>.<p class="bodytext">After seven weeks on top, Barty slips to second with Pliskova in third.</p>.<p class="bodytext">The only other movement in the top 10 sees Williams, a finalist in Toronto, climbing two places to eighth with Sloane Stephens going in the other direction.</p>.<p class="bodytext">Canadian Bianca Andreescu, who won the Rogers Cup following Williams' withdrawal with back spasms in the opening set of the final, climbs 13 places to 14.</p>