Aryna Sabalenka returned to top spot in the WTA rankings on October 21 after leapfrogging Iga Swiatek. The change in positions has set up a thrilling end to the season, with next month's WTA Finals likely to prove decisive in the race to end the year as world number one.
Sabalenka has had a spectacular season, defending her Australian Open title in January and adding the US Open trophy to her cabinet last month, as well as enjoying victories in Cincinnati and Wuhan.
