Brazilian Joao Fonseca advanced to the last eight of the Swiss Indoors after Czech Jakub Mensik, the No 7 seed, withdrew before the match at the St. Jakobshalle. in Basel on Thursday night.
Fonseca, ranked No 46, will face the winner of the match between French lucky loser Valentin Royer and Canadian Denis Shapovalov, the No 9 seed, next.
Ahead of his victory, the 19-year-old Brazilian won against Frenchman Giovanni Mpetshi Perricard (7-6 (6), 6-3).
Basel ATP 500, other second-round results (St. Jakobshalle., hard, EUR 2.523.045, most recent results first):
Jaume Munar vs. Ben Shelton
Felix Auger-Aliassime vs. Marin Cilic
Valentin Royer vs. Denis Shapovalov
Casper Ruud vs. Stan Wawrinka
Reilly Opelka vs. Botic van de Zandschulp
Jenson Brooksby vs. Alejandro Davidovich Fokina