Italy's Matteo Berrettini beat Brazil's Joao Fonseca to give his side a flying start and Matteo Arnaldi then outlasted Thiago Monteiro to put the hosts into a 2-0 lead.
Jannik Sinner overcame a debilitating medical episode as well as Dane Holger Rune to reach the quarter-finals of the Australian Open for the third time.
Atletico Madrid's problems deepened as they were held to a 0-0 draw at Villarreal in La Liga on Friday, stretching their winless run to four games in all competitions.
Paris St Germain extended their Ligue 1 lead to 13 points with a 4-3 home victory against Girondins de Bordeaux on Sunday but the French champions were again exposed at the back and had Neymar sent off. A Marquinhos double, Edinson Cavani's 200th PSG goal and a goal by Kylian Mbappe put the capital side on 65 points from 26 games but they lost captain Thiago Silva to a muscle injury and Neymar picked up a straight red card for a late challenge in stoppage time.