Chinese qualifier Wang Xinyu upset US Open champion Emma Raducanu 6-1, 6-7 (0), 7-5 in the second round of the Upper Austria Ladies Linz. (More Tennis News)
The 18-year-old Raducanu, who was the top seed at a WTA event for the first time, held serve in the opening game but lost the next six while winning just two points on the 106th-ranked Wang's serve.
Raducanu lost a 4-2 lead in the second set but won it in the tiebreaker. She took a medical timeout before saving two match points on Wang's serve at 5-4 in the third but the qualifier broke Raducanu again and closed out the win in her next service game.
Wang Xinyu next plays Alison Riske. The eighth-seeded Riske defeated Alizé Cornet 6-4, 6-4.
Second-seeded Simona Halep beat Aliaksandra Sasnovich of Belarus 7-5, 6-3 to set up a quarterfinal against Jasmine Paolini of Italy, and third-seeded Danielle Collins of the United States eased past Greet Minnen of Belgium 6-1, 6-2.
Also advancing were Alison Van Uytvanck of Belgium, Jaqueline Cristian of Romania, and Veronika Kudermetova of Russia.