MUNICH — Danish teenager Holger Rune upset top-seeded Alexander Zverev 6-3, 6-2 to reach the quarterfinals of the BMW Open.
The 18-year-old Rune broke Zverev’s first service game in each set to take control of the match on his way to his first career win over a player ranked in the the top 10.
“I have a lot of respect for him, and I obviously didn’t expect to win in two sets, and with a score like this,” Rune said. “But it was a really hard match, we played a lot of rallies and I’m really happy about my performance today.”
It was the first time since 2014 that Zverev, a two-time winner of the tournament, lost his opening match on the Munich clay courts. The German has yet to win a title this year after winning six last year, including the Olympic gold medal. Rune is ranked 70th and had not won back-to-back matches in the main draw of any ATP Tour event this season until now.
Rune next faces Finland’s Emil Ruusuvuori, who won 6-3, 6-3 against Maxime Cressy.
Fourth-seeded Nikoloz Basilashvili needed nearly two hours to beat Ilya Ivashka 3-6, 6-2, 6-4 and set up a quarterfinal with seventh-seeded Miomir Kecmanovic. Cristian Garin lost an all-Chilean first-round match 6-3, 6-4 against Alejandro Tabilo, and Botic van de Zandschulp beat Brandon Nakashima 7-6 (3), 6-3.
DALLAS – Marcos Giron advanced to the second round of the Dallas Open with a 6-4, 6-7 (1), 6-1 victory over Alex Rybakov on Tuesday.
The seventh-seeded Giron, who reached the semifinals of the inaugural event a year ago, responded quickly after failing to close out the second set, winning the first five games of the deciding set.
Rybakov broke his fellow American when Giron was serving for the match in the second set. Then Rybakov won the first six points of the second-set tiebreaker.
“I’m really happy with how I was able to reset in the third and just get back to the game plan from the beginning and elevate,” Giron said. “He played well and served well and kind of hung in there.”
Eighth-seeded Adrian Mannarino of France won the final five points of a first-set tiebreaker and the last four games of the second to beat American Steve Johnson 7-6 (6), 6-2.
J.J. Wolf, the No. 6 seed, had little trouble in a 6-3, 6-3 victory over fellow American Brandon Holt.
John Isner, the fifth seed and unofficial tournament host in his hometown event, played later Tuesday. Like Giron, Isner lost in the semifinals last year.
DALLAS – Wild-card entry Jack Sock opened with a 7-6 (2), 4-6, 6-4 victory over Ilya Ivashka at the Dallas Open, setting up a second-round meeting with top-seeded fellow American Taylor Fritz.
Sock broke Ivashka’s serve in the final game to win the match. Ivashka fell behind 2-0 to start the final set but broke Sock to get back on serve.
Down a break early in the second set, Ivashka rallied to force the deciding set after Sock cruised in the first-set tiebreaker.
The eighth-ranked Fritz is back for the second Dallas Open after losing in the semifinals as the top seed in the inaugural edition of the indoor hard-court event last year. Defending champion Reilly Opelka isn’t in the field.