ATP roundup: Top seeds fall in Antwerp, Stockholm, Almaty

Frenchman Hugo Gaston ousted No. 1 seed Alex de Minaur of Australia 6-3, 3-6, 7-5 as the top three seeds all bowed out of the European Open quarterfinals on Friday in Antwerp, Belgium.

Gaston converted 3 of 4 break points and finished with a 36-26 edge in winners, including a 20-8 advantage in the third set.

Joining de Minaur on the sidelines were second seed Stefanos Tsitsipas of Greece and third seed Felix Auger-Aliassime of Canada. Czech fifth seed Jiri Lehecka swept past Tsitsipas 6-4, 6-4, while Spaniard Roberto Bautista Agut rallied for a 3-6, 6-2, 7-6 (6) victory over Auger-Aliassime, despite the Canadian firing 19 aces and saving three match points.

Gaston will face Bautista Agut in the semifinals, while Lehecka will take on American eighth seed Marcos Giron, a 6-2, 6-2 winner over Belgium's Zizou Bergs.

BNP Paribas Nordic Open

Three-time major winner Stan Wawrinka of Switzerland drew another step closer to an elusive tournament title when he felled No. 1 seed Andrey Rublev of Russia 7-6 (5), 7-6 (5) in the quarterfinals in Stockholm.

Wawrinka, 39, hasn't won on the ATP Tour since May 2017. He is the third-oldest semifinalist at an ATP event since 1990. His age didn't stop him from firing 14 aces past Rublev and saving 3 of 4 break points.

Wawrinka's semifinal opponent will be American No. 4 seed Tommy Paul, who beat Serbia's Miomir Kecmanovic 7-6 (9), 6-2. Dutch seventh seed Tallon Griekspoor upset Norwegian No. 2 seed Casper Ruud 7-5, 7-6 (5), and third seed Grigor Dimitrov of Bulgaria beat Switzerland's Dominic Stricker 6-3, 6-2.

Almaty Open

Aleksandar Vukic of Australia fended off No. 1 seed Frances Tiafoe 6-2, 7-6 (11) in the quarterfinals in Kazakhstan.

Vukic, who had 13 aces among his 35 winners, trailed the