New York-Sana
Croatia's Donna Vikic beat Germany's Julia Georgis 6-7, 7-5, 6-3 to reach the US Open quarter-finals for the first time.
Vikic, ranked 23, is in her second grand slam event for the first time in her career and won her first victory over Georgis, who has beaten her three times before.
The 23-year-old Croatian plays in the quarter-finals against Swiss Belinda Benicic, who surprised earlier in the day by defeating world number one Naomi Osaka.
Vikic won easily in the last match against the 13th seed at the French Open 6-4 6-1.