BASEL, Switzerland — Second-seeded Alexander Zverev was eliminated in the first round of the Swiss Indoors on Tuesday, losing 7-6 (7), 6-4 to Taylor Fritz.
Zverev led 4-0 in the first-set tiebreaker and later held a set point before Fritz took his chance to clinch it with an ace.
The 31st-ranked American got the only service break of the match in the third game of the second set and converted his first match point with a two-handed backhand winner.
The loss rules out a possible final for Zverev against top-seeded Roger Federer, who part owns the agency which manages the sixth-ranked German’s career.
The defeat also harms Zverev’s chances of defending his ATP Finals title next month. He is seventh in the season-long standings to advance to the eight-man event in London.
In Federer’s half of the draw, third-seeded Stefanos Tsitsipas and fifth-seeded Fabio Fognini both advanced Tuesday.
Tsitsipas beat Albert Ramos-Vinolas 6-3, 7-6 (6) and Fognini eased past qualifier Alexei Popyrin 6-2, 6-4.
Federer next plays Wednesday against Radu Albot, after the 49th-ranked Moldovan won 2-6, 6-3, 6-4 against Dusan Lajovic.
In a match of zero break point chances, 37th-ranked Reilly Opelka beat No. 38 Cristian Garrin 7-6 (5), 7-6 (10).
The 22-year-old American had 27 aces in his victory and dropped only one point when landing his first serve.
PARMA, Italy — Top-seeded Maria Sakkari rallied past 97th-ranked Maryna Zanevska 2-6, 6-4, 6-4 on Thursday at the Parma Ladies Open to reach her first semifinal since the grass-court season.
Sakkari, who has gone three sets in all three of her matches this week, will face Danka Kovinic for a spot in the final of the clay-court event after Kovinic beat Jasmine Paolini 6-4, 6-4.
In her previous semifinal, Sakkari lost to Belinda Bencic in Berlin in June. The seventh-ranked Greek player was eliminated by Wang Xiyu in the second round of the U.S. Open on Aug. 31.
In the bottom half of the draw, Mayar Sherif of Egypt beat American opponent Lauren Davis 7-6 (2), 6-3 to reach her second career semifinal. Sherif next faces Ana Bogdan, who defeated fellow Romanian Irina-Camelia Begu 6-2, 7-6 (6).
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.