Humbert stuns Fritz at Swiss Indoors, Zverev and Rybakina secure WTA Finals spots

Unseeded Frenchman Ugo Humbert toppled top seed Taylor Fritz 6-3, 6-4 in the Swiss Indoors last 16 on Thursday.

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This was the second American Humbert, 27, has knocked out in Basel following his first round defeat of Sebastian Korda 24 hours earlier.

The French number one left-hander’s reward is a quarterfinal match-up against US qualifier Reilly Opelka.

Last Sunday the world number 24 Humbert reached the final of the Stockholm ATP 250 tournament where he was beaten in two sets by Norway's Casper Ruud.

Ruud, the fourth seed, downed veteran home hope Stan Wawrinka 6-4, 7-6 (7/5) in Basel to set up a quarterfinal date with Alejandro Davidovich Fokina.

Defeat for Fritz came on the back of his battling three-set first round win over this month’s Shanghai Masters champion Valentin Vacherot.

Basel second seed Ben Shelton was also sent packing, 6-3 6-4 by Spain’s Jaume Munar, who faces fifth-seed Felipe Auger-Aliassime in the last eight.

Meanwhile, twice ATP Finals champion Alexander Zverev booked his place in the season-ending championship after progressing to the semifinals of the Vienna Open on Friday, marking his eighth qualification in the past nine seasons.