Rafael Nadal got his bid for a 13th Roland Garros title off to a comfortable start on Monday with a 6-4, 6-4, 6-2 win over Egor Gerasimov of Belarus.
World No 2 Nadal can level Roger Federer's record of 20 Slam titles with victory in Paris.
The 34-year-old will take on Mackenzie McDonald of the United States for a place in the last 32.
French Open results at Roland Garros on Monday, the second day of the delayed 2020 championship (x denotes seeded player):
Men
First round
Jiri Vesely (CZE) bt Liam Broady (GBR) 6-2, 5-7, 6-3, 6-2
Lorenzo Sonego (ITA) bt Emilio Gomez (ECU) 6-7 (6/8), 6-3, 6-1, 6-7 (4/7), 6-3
Lorenzo Giustino (ITA) bt Corentin Moutet (FRA) 0-6, 7-6 (9/7), 7-6 (7/3), 2-6, 18-16
Hugo Gaston (FRA) bt Maxime Janvier (FRA) 7-6 (7/5), 6-4, 6-3
Yoshihito Nishioka (JPN) bt Felix Auger-Aliassime (CAN x19) 7-5, 6-3, 6-3
Casper Ruud (NOR x28) bt Yuichi Sugita (JPN) 6-1, 6-3, 6-1
Tommy Paul (USA) bt James Duckworth (AUS) 6-2, 6-3, 6-2
Jack Sock (USA) bt Reilly Opelka (USA) 6-4, 6-4, 6-3
Dominic Thiem (AUT x3) bt Marin Cilic (CRO) 6-4, 6-3, 6-3
Pierre-Hugues Herbert (FRA) bt Michael Mmoh (USA) 6-3, 6-2, 6-3
Mikhail Kukushkin (KAZ) bt Fabio Fognini (ITA x14) 7-5, 3-6, 7-6 (7/1), 6-0
Pedro Martinez (ESP) bt Aleksandar Vukic (AUS) 7-5, 6-4, 6-0
Mackenzie McDonald (USA) bt Steven Diez (CAN) 4-6, 6-3, 6-3, 6-4
Rafael Nadal (ESP x2) bt Egor Gerasimov (BLR) 6-4, 6-4, 6-2
Women
First round
Bernarda Pera (USA) bt Cici Bellis (USA) 7-6 (7/3), 6-1
Amanda Anisimova (USA x25) bt Tamara Korpatsch (GER) 6-2, 6-0
Hsieh Su-Wei (TPE) bt Barbara Haas (AUT) 6-3, 7-6 (7/1)
Iga Swiatek (POL) bt Marketa Vondrousova (CZE x15) 6-1, 6-2
Anastasia Pavlyuchenkova (RUS) bt Svetlana Kuznetsova (RUS x28) 6-1, 2-6, 6-1
Katerina Siniakova (CZE) bt Lauren Davis (USA) 7-6 (7/5), 6-2
Sara Errani (ITA) bt Monica Puig (PUR) 6-2, 6-1
Kiki Bertens (NED x5) bt Katarina Zavatska (UKR) 2-6, 6-2, 6-0
Elina Svitolina (UKR x3) bt Varvara Gracheva (RUS) 7-6 (7/2), 6-4
Renata Zarazua (MEX) bt Elsa Jacquemot (FRA) 6-1, 6-2
Tsvetana Pironkova (BUL) bt Andrea Petkovic (GER) 6-3, 6-3
Serena Williams (USA x6) bt Kristie Ahn (USA) 7-6 (7/2), 6-0
Garbine Muguruza (ESP x11) bt Tamara Zidansek (SLO) 7-5, 4-6, 8-6
Christina McHale (USA) bt Karolina Muchova (CZE x22) 6-2, 6-4
Petra Kvitova (CZE x7) bt Oceane Dodin (FRA) 6-3, 7-5
Jasmine Paolini (ITA) bt Aliona Bolsova (ESP) 6-4, 6-3
Zhang Shuai (CHN) bt Madison Keys (USA x12) 6-3, 7-6 (7/2)