Switzerland's Jill Teichmann scored the biggest upset of her career with a victory over world number two Naomi Osaka at the Cincinnati Open on Thursday (19 August).

The 76th-ranked Teichmann came back from one set down to snatch a 3-6, 6-3, 6-3 win to reach the women's quarterfinals.

Osaka commited 41 unforced errors compared to Teichmann's 29.