A season that began with doubts has given way to a Wimbledon revival and a Cincinnati final. Now Iga Swiatek chases Aryna Sabalenka into the year-end showdown in Riyadh.

Iga Swiatek is through to the quarterfinals of the Cincinnati Open for the third year running after defeating Sorana Cîrstea 6-4, 6-3 on a hot afternoon in Ohio. The World No. 1’s mix of heavy ...