Russian top seed Daniil Medvedev overcame a poor start to beat Jannik Sinner 1-6 6-1 6-2 and reach the Open 13 quarterfinals on Thursday.

The US Open runner-up, who lost in the fourth round of the Australian Open last month, dropped his serve twice but broke the 18-year-old Italian’s serve four times at the indoor tournament in Marseille.

The fifth-ranked Medvedev, who had seven aces, next faces French veteran Gilles Simon – who won their two previous meetings. Simon advanced with a 7-6 (8-6), 6-4 win against Aljaz Bedene.

Also on Thursday, fourth-seeded Denis Shapovalov hit 17 aces in a 6-4 4-6 6-2 win against hard-hitting Croat Marin Cilic. The 20-year-old Canadian next plays Alexander Bublik.

In later matches, 19-year-old Canadian Felix Auger-Aliassime – seeded seventh – was facing Frenchman Pierre Hugues-Herbert with No. 3 David Goffin playing qualifier Egor Gerasimov.