Stan Wawrinka upsets top seed Daniil Medvedev at Metz

Stan Wawrinka pulled off a stunning upset on Thursday, beating top-seeded Daniil Medvedev 6-4, 6-7 (7), 6-3 to reach the quarterfinals of the Moselle Open in Metz, France.

The 37-year-old from Switzerland improved to 2-2 all-time against Medvedev, the former world No. 1 from Russia, who had nine aces but was hurt by 12 double faults. Wawrinka will next face Sweden's Mikael Ymer, who was a 6-4, 6-3 winner over Gregoire Barrere of France.

Second-seeded Hubert Hurkacz of Poland defeat Austria's Dominic Thiem 6-3, 6-4, while No. 4 seed Holger Rune led 6-4, 4-1 when France's Benjamin Bonzi retired due to a knee injury.

Frenchman Arthur Rinderknech toppled fifth seed Nikoloz Basilashvili 7-6 (11), 6-3, winning the first-set tiebreaker on his sixth set point. Also posting victories were No. 7 seed Alexander Bublik of Kazakhstan and Italy's Lorenzo Sonego.