Cameron Norrie dug deep to claim victory over home wildcard Facundo Diaz Acosta in his first outing at the Argentina Open on Wednesday.
The world number 12 needed to fight back from behind to see off the local favourite 4-6 7-5 7-6 (6) in Buenos Aires.
Norrie, the second seed, will now face another Argentinian in Tomas Martin Etcheverry in the quarter-finals.
Top seed and former world number one Carlos Alcaraz was successful in his long-awaited comeback on Wednesday night.
The US Open champion, who was forced to miss the Australian Open through injury, battled past Serbian Laslo Djere 6-2 4-6 6-2.
The 19-year-old Spaniard has not played since November and recently lost top spot in the rankings to veteran Novak Djokovic.
“It’s a great feeling to win again,” Alcaraz said, in post-match comments carried by tennis.com.
“It’s been a long time for me, no competition and no matches, just recovery. And finally I got my first win of 2023.”
Alcaraz will next face another Serbian in Dusan Lajovic, who suffered a straight-sets loss in the pair’s only previous meeting in the second round of last year’s Australian Open.
In Rotterdam, world number five Andrey Rublev lost 6-4 6-4 to Australian Alex De Minaur at the ABN AMRO Open.