HALLE, Germany — Yuichi Sugita of Japan upset third-seeded Dominic Thiem 6-2, 7-5 at the grass-court Gerry Weber Open on Wednesday.
The 52nd-ranked Sugita forced 13 break opportunities and took three as he advanced to a quarterfinal against American qualifier Denis Kudla.
Kudla defeated Stefanos Tsitsipas 6-3, 6-4 in their second-round match.
Seventh-seeded Kei Nishikori lost 6-2, 6-2 to Karen Khachanov of Russia.
Fourth-seeded Roberto Bautista Agut stayed in control against Robin Haase, winning 6-4, 7-5, and the Spaniard will next face Khachanov.
Defending champion Roger Federer plays Benoit Paire in the second round on Thursday.
PARMA, Italy — Top-seeded Maria Sakkari rallied past Arantxa Rus 3-6, 6-2, 6-3 to reach the quarterfinals of the Parma Ladies Open.
Sakkari, who accepted a late wild card to the red clay court tournament, was playing her first event since losing to Wang Xiyu in the second round of the U.S. Open.
The Greek player will next face Maryna Zanevska of Belgium after she eased past Dalma Galfi 6-1, 6-3.
Fourth-seeded Sloane Stephens of the United States, the 2017 U.S. Open champion, lost to Danka Kovinic 7-5, 2-6, 7-5.
Kovinic will face Jasmine Paolini in the quarterfinals after the Italian defeated compatriot Elisabetta Cocciaretto 4-6, 6-3, 6-4.
There will be an American in the final eight, however, as Lauren Davis rallied to beat Sara Sorribes Tormo 3-6, 6-4, 7-5. Sorribes Tormo had eliminated second-seeded Martina Trevisan in straight sets in the opening round.
Davis will play Mayar Sherif after the Egyptian player defeated Simona Waltert 6-3, 7-6 (1).
Also, third-seeded Irina-Camelia Begu of Romania eased past Italian wild card Matilde Paoletti 6-4, 6-4 to set up a quarterfinal against sixth-seeded Ana Bogdan, who beat Anna Karolina Schmiedlova 6-2, 3-6, 6-3.
PARMA, Italy — Sara Sorribes Tormo beat second-seeded Martina Trevisan 7-5, 6-0 in the opening round of the Parma Ladies Open – marking the third consecutive first-round loss for this year’s French Open semifinalist.
Third-seeded Irina-Camelia Begu advanced when Viktoriya Tomova retired with Begu leading 7-5, 5-1.
Danka Kovinic beat Oceane Dodin 6-1, 3-6, 6-4 and will next face 2017 U.S. Open champion Sloane Stephens.
Also on the red clay courts, Mayar Sherif of Egypt eliminated fifth-seeded Anna Bondar 7-5, 6-4; Elisabetta Cocciaretto defeated seventh-seeded Nuria Parrizas Diaz 7-5, 6-1; and Italian wild card Matilde Paoletti earned her first tour-level win by beating Romanian qualifier Gabriela Lee 6-4, 3-6, 6-0.