Russian Daniil Medvedev, the No 11 seed, advanced to the last 16 of Paris Masters after Bulgarian Grigor Dimitrov withdrew before the match at the La Défense Arena on Wednesday afternoon.
Dimitrov was back to competition last Monday after fourteen weeks out of the Tour, and then played with Nicolas Mahut in doubles on Tuesday. Dimitrov, ranked No 38, won against Frenchman Giovanni Mpetshi Perricard (7-6 (5), 6-1).
Medvedev, ranked No 13, will face the winner of the match between No 7 seed Lorenzo Musetti and Lorenzo Sonego next.
Paris Masters 1000, other second-round results (La Défense Arena, hard, EUR 6.128.940, most recent results first):
Karen Khachanov vs. Joao Fonseca
Corentin Moutet vs. Alexander Bublik
Gabriel Diallo vs. Alex De Minaur
Lorenzo Musetti vs. Lorenzo Sonego
Zizou Bergs vs. Jannik Sinner
Alejandro Davidovich Fokina vs. Arthur Cazaux
Camilo Ugo Carabelli vs. Alexander Zverev
Felix Auger-Aliassime vs. Alexandre Muller: wednesday
Francisco Cerundolo vs. Miomir Kecmanovic
Arthur Rinderknech vs. Valentin Vacherot: wednesday
Daniel Altmaier beat Casper Ruud (8): 6-3, 7-5
Taylor Fritz (4) beat Aleksandar Vukic (Q): 7-6 (4), 6-2
Andrey Rublev (12) beat Learner Tien: 6-4, 6-4
Cameron Norrie beat Carlos Alcaraz (1): 4-6, 6-3, 6-4
Ben Shelton (5) beat Flavio Cobolli: 7-6 (4), 6-3