Third seed Casper Ruud rallied from a set down on Thursday to open his account after a bye with a 2-6, 6-1, 6-4 defeat of Dominic Koepfer at the Geneva Open.
The Norwegian who thrives on clay booked into a quarter-final against Spain’s Swiss nemesis Pablo Andujar, who has beaten Roger Federer and teenaged Dominic Stricker this week.
Ruud, ranked 21st and making his tournament debut, saved five of seven break points as he fought back against his opponent aged 27 and ranked 59th.
The seed lost serve twice in the opening set and returned the favour in the second to level.
In the third, he got away to a 2-1 lead and was never challenged.
Ruud has clay-court semi-finals this spring in Monte Carlo, Munich and Madrid.