Brown beats top-seeded Zverev at Stuttgart Open

The Associated Press
Germany's Dustin Brown serves to Portugal's Joao Sousa during their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 15, 2018. (AP Photo/Ng Han Guan)
Germany's Dustin Brown serves to Portugal's Joao Sousa during their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 15, 2018. (AP Photo/Ng Han Guan)

STUTTGART, Germany (AP) -- German qualifier Dustin Brown upset top-seeded Alexander Zverev 6-4, 6-7 (3), 6-3 Thursday to reach the quarterfinals of the Stuttgart Open.

Brown was playing just his second tour-level match of the year but hit a number of spectacular winners to beat the fifth-ranked Zverev and record his first win against a top-10 opponent since 2017.

The 170th-ranked Brown, who is best known for beating Rafael Nadal at Wimbledon in 2015, next plays Canada's Felix Auger-Aliassime, who defeated Gilles Simon 7-5, 6-4 at the grass-court tournament.

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Matteo Berrettini caused another upset earlier Thursday, defeating second-seeded Karen Khachanov 6-4, 6-2.

The Italian next faces American player Denis Kudla, who advanced with a 7-5, 6-7 (3), 7-6 (3) win over Gael Monfils.

The Stuttgart Open made the switch from clay to grass in 2015.

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