Paris - Juan Martin del Potro recovered from a poor first set to beat Frenchman Nicolas Mahut 1-6, 6-1, 6-2, 6-4 in the French Open first round on Tuesday.
The former US Open champion, who retired injured at the Italian Open earlier this month, had said he would make a last-minute decision on his fitness at Roland Garros.
But the Argentinian fifth seed, a semi-finalist in 2009, came through his match against Mahut with relative comfort after his difficult start and broke wildcard Mahut's serve five times.
Del Potro will take on either his compatriot Leonardo Mayer or French veteran Julien Benneteau in round two.
Results from day three of the French Open at Roland Garros on Tuesday (x denotes seeding):
Men
First round
Rafael Nadal (ESP x1) bt Simone Bolelli (ITA) 6-4, 6-3, 7-6 (11/9)
Guido Pella (ARG) bt Joao Sousa (POR) 6-2, 6-3, 6-4
Denis Shapovalov (CAN x24) bt John Millman (AUS) 7-5, 6-4, 6-2
Maximilian Marterer (GER) bt Ryan Harrison (USA) 6-1, 6-3, 7-5
Ruben Bemelmans (BEL) bt Yuki Bhambri (IND) 6-4, 6-4, 6-1
Jurgen Zopp (EST) bt Jack Sock (USA x14) 6-7 (4/7), 6-2, 4-6, 7-6 (7/5), 6-3
Thomas Fabbiano (ITA) bt Matthew Ebden (AUS) 6-4, 5-7, 6-2, 3-6, 6-2
Sergiy Stakhovsky (UKR) bt Feliciano Lopez (ESP x28) 6-2, 6-4, 6-2
Mischa Zverev (GER) bt Florian Mayer (GER) 6-2, 6-1, 7-6 (7/3)
Pablo Cuevas (URU) bt Aljaz Bedene (SLO) 6-4, 6-3, 6-2
Kevin Anderson (RSA x6) bt Paolo Lorenzi (ITA) 6-1, 6-2, 6-4
Marin Cilic (CRO x3) bt James Duckworth (AUS) 6-3, 7-5, 7-6 (7/4)
Hubert Hurkacz (POL) bt Tennys Sandgren (USA) 6-2, 6-2, 3-6, 6-3
Jan-Lennard Struff (GER) bt Evgeny Donskoy (RUS) 6-1, 6-3, 6-0
Steve Johnson (USA) bt Adrian Mannarino (FRA x25) 7-6 (7/1), 6-2, 6-2
Fabio Fognini (ITA x18) bt Pablo Andujar (ESP) 6-4, 6-2, 6-1
Elias Ymer (SWE) bt Dudi Sela (ISR) 7-6 (7/3), 6-3, 6-1
Marton Fucsovics (HUN) bt Vasek Pospisil (CAN) 6-3, 6-3, 7-6 (7/5)
Kyle Edmund (GBR x16) bt Alex De Minaur (AUS) 6-2, 6-4, 6-3
John Isner (USA x9) bt Noah Rubin (USA) 6-3, 7-6 (9/7), 7-6 (9/7)
Horacio Zeballos (ARG) bt Yuichi Sugita (JPN) 6-4, 6-7 (3/7), 6-4, 6-2
Juan Martin del Potro (ARG x5) bt Nicolas Mahut (FRA) 1-6, 6-1, 6-2, 6-4
Women
First round
Taylor Townsend (USA) bt Myrtille Georges (FRA) 6-4, 6-2
Bethanie Mattek-Sands (USA) bt Johanna Larsson (SWE) 6-4, 6-3
Daria Gavrilova (AUS x24) bt Sorana Cirstea (ROU) 4-6, 7-6 (7/4), 6-3
Elise Mertens (BEL x16) bt Varvara Lepchenko (USA) 6-7 (9/11), 7-6 (7/4), 6-0
Angelique Kerber (GER x12) bt Mona Barthel (GER) 6-2, 6-3
Ana Bogdan (ROU) bt Marketa Vondrousova (CZE) 6-3, 1-6, 6-4
Aliaksandra Sasnovich (BLR) bt Denisa Allertova (CZE) 6-4, 6-3
Kiki Bertens (NED x18) bt Aryna Sabalenka (BLR) 6-2, 6-1
Zhang Shuai (CHN x27) bt Kristna Kucova (SVK) 6-0, 7-5
Irina Camelia Begu (ROU) bt Anna Karolina Schmiedlova (SVK) 6-4, 5-7, 9-7
Peng Shuai (CHN) bt Aleksandra Krunic (SRB) 6-3, 6-4
Caroline Garcia (FRA x7) bt Duan Ying-Ying (CHN) 6-1, 6-0
Garbine Muguruza (ESP x3) bt Svetlana Kuznetsova (RUS) 7-6 (7/0), 6-2
Fiona Ferro (FRA) bt Carina Witthoeft (GER) 6-4, 6-2
Samantha Stosur (AUS) bt Yanina Wickmayer (BEL) 6-2, 6-4
Anastasia Pavlyuchenkova (RUS x30) bt Polona Hercog (SLO) 6-4, 7-6 (7/1)
Julia Goerges (GER x11) bt Dominika Cibulkova (SVK) 6-4, 5-7, 6-0
Alison Van Uytvanck (BEL) bt Isabelle Wallace (AUS) 6-1, 6-0
Serena Williams (USA) bt Kristyna Pliskova (CZE) 7-6 (7/4), 6-4
Ashleigh Barty (AUS x17) bt Natalia Vikhlyantseva (RUS) 6-3, 6-1
Maria Sharapova (RUS x28) bt Richel Hogenkamp (NED) 6-1, 4-6, 6-3