Stefanos Tsitsipas beat Benoit Paire and Richard Gasquet defeated David Goffin at the Ultimate Tennis Showdown.
Daniil Medvedev proved too strong for Jannik Sinner in Marseille, while David Goffin suffered another upset.
Daniil Medvedev was followed out of the Rotterdam Open by Stefanos Tsitsipas and David Goffin on Thursday.
Daniil Medvedev lost in the first round of the Rotterdam Open, with Roberto Bautista Agut and Grigor Dimitrov also losing on Wednesday.
Vasek Pospisil battled past David Goffin to reach the Open Sud de France final, where he will meet former champion Gael Monfils.
Gael Monfils is two victories away from winning the Open Sud de France for a third time in Montpellier.
Belgium's David Goffin joins a strong French contingent in the quarter-finals of the Open Sud de France after overcoming Alexander Bublik.
Despite taking a medical time-out with a hamstring injury in the first set, Nick Kyrgios beat Karen Khachanov in five to face Rafael Nadal.
A wasteful Rafael Nadal joined Daniil Medvedev and Alexander Zverev in the Australian Open third round.
Spain clinched a 2-1 victory over Belgium in the ATP Cup quarter-finals after Rafael Nadal made up for losing his singles match.