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Chasing his first Top 10 win since he upset Carlos Alcaraz at the Rolex Paris Masters nearly 12 months ago, Humbert outhit Fritz by 22 winners to 20 to set a quarter-final clash with Reilly Opelka.

Humbert secured his win against Fritz after converting two of five break points he earned. 

The 27-year-old Frenchman has won a Tour-leading 21 matches indoors since the start of 2024, a tally that includes two title runs in Marseille. He also reached championship matches in Paris last November and Stockholm last week.

Opelka earlier booked his last-eight spot by holding off Botic van de Zandschulp 7-6(5), 6-7(7), 6-3. 

The quarter-final will be the maiden clash between Humbert and Opelka.

Felix Auger-Aliassime has returned to winning ways at one of his favourite haunts, just when he needed it most.

The two-time Basel champion edged Marin Cilic 7-6(2), 7-6(2) to book a quarter-final spot and simultaneously boost his ATP Finals qualification hopes. 

A year ago, Auger-Aliassime lost in the second round to eventual champion Giovanni Mpetshi Perricard for his only defeat across his first three Basel appearances. Twelve months on and the 2022 and 2023 champion made no mistake at the same stage against Cilic.

Auger-Aliassime outhit the Croatian former World No. 3 by 38 winners to 21. Although both sets went to tie-breaks, it was the fifth-seeded Canadian who finished stronger each time to complete a one-hour, 47-minute triumph.

As the race for the remaining ATP Finals nears its climax, Auger-Aliassime could hardly have picked a more crucial moment to string together a six-match winning streak on the indoor hard courts of Europe. Having lifted his third ATP 250 title of the season in Brussels on Monday, the Canadian has now defeated two tough, big-serving opponents in Gabriel Diallo and Cilic to reach the last eight in Basel.

The 25 year-old Auger-Aliassime remains ninth in the ATP Live Race To Turin, but he is hot on the heels of those above him. He is just 400 points behind seventh-placed Alex de Minaur (who is this week into the Vienna quarter-finals) and 290 points behind Lorenzo Musetti (who is also still alive in the Vienna draw).

Another Turin hopeful, sixth-placed Ben Shelton, could not set a quarter-final showdown with Auger-Aliassime in Basel. Jaume Munar upset the 2024 finalist 6-3, 6-4 for the fourth Top 10 win of his career. 

Munar has won all three of his matches with Shelton in 2025 (Dallas, Rome, Basel).

Casper Ruud remains an outsider for a ATP Finals spot. Yet the Norwegian is doing all he can in Basel, where he ended home favourite Stan Wawrinka’s run with a 6-4, 7-6(5) win. 

Ruud takes on Alejandro Davidovich Fokina for a semi-final spot.

Denis Shapovalov was another second-round winner. 

The Canadian downed Valentin Royer 7-6(3), 6-2 to book a quarter-final meeting against Joao Fonseca.