Ten seeded players were in action during the Cincinnati Open quarterfinals Aug. 15. Here's how the action unfolded in Mason.

Elena Rybakina is set to face Iga Swiatek in the semi-finals of the Cincinnati Open. Despite just making her sixth appearance at Cincinnati, Rybakina has beaten two Grand Slam champions en route to the last four of the WTA 1000 tournament.

But Vukov refused to sit silently - and after appealing the WTA's ban - he won his case and rejoined Rybakina's team at the Cincinnati Open. And that is already having a positive impact on the Kazakh, who is through to the semifinal after ousting top seed Aryna Sabalenka 6-1 6-4.