Muchová needs nine match points to beat Osaka; Alexandrova stuns Nosková
Karolína Muchová survived a near three-hour thriller against Naomi Osaka to set up an all-Czech quarterfinal in Beijing, while Alexandrova routed the Wimbledon champion.
Karolína Muchová survived a near three-hour thriller against Naomi Osaka to set up an all-Czech quarterfinal in Beijing, while Alexandrova routed the Wimbledon champion.

Kimberly Birrell won her first WTA Tour-level singles title at the Korea Open, beating compatriot Maya Joint 6-4, 6-2 in an all-Australian final at age 28.

Elena Rybakina crushed 13th-seeded Naomi Osaka 6-1, 6-4 in the US Open round of 16. A semifinal berth would hand her the world No. 1 ranking for the first time.