Katie Boulter vs Kateřina Siniaková · Semifinal · WTA Osaka

Katie Boulter and Kateřina Siniaková are set to meet in the semifinals of the WTA Osaka tournament. Boulter, ranked 58th in singles, faces Siniaková, ranked 86th in singles but holding the world No. 1 doubles ranking. Their most recent head-to-head encounter came on April 22, 2025, at the WTA Madrid event, where Boulter defeated Siniaková 4-6, 6-2, 6-1.