Cameron Norrie and Carlos Alcaraz through in Argentina
The world number 12 needed to fight back from behind to see off the local favourite Facundo Diaz Acosta 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. Read More..