Paris - Fourth seed Grigor Dimitrov clinched a marathon 6-7 (2/7), 6-4, 4-6, 6-4, 10-8 victory over American Jared Donaldson to book a last-32 spot at Roland Garros on Wednesday.
The Bulgarian was pushed all the way by world number 57 Donaldson in a match that lasted four hours and 19 minutes, but grabbed the crucial break in the 17th game of the deciding set as his opponent started to struggle with cramp.
Dimitrov will face dangerous Spaniard Fernando Verdasco next as he looks to reach the fourth round in Paris for the first time.
Results from day four of the French Open at Roland Garros on Wednesday (x denotes seeding):
Men
1st round
Pierre-Hugues Herbert (FRA) bt Peter Polansky (CAN) 6-3, 4-6, 6-2, 6-2
2nd rd
Marco Cecchinato (ITA) bt Marco Trungelliti (ARG) 6-1, 7-6 (7/1), 6-1
Pablo Carreo-Busta (ESP x10) bt Federico Del Bonis (ARG) 7-6 (7/0), 7-6 (7/2), 3-6, 6-4
Roberto Bautista Agut (ESP x13) bt Santiago Giraldo (COL) 6-4, 7-5, 6-3
Novak Djokovic (SRB x20) bt Jaume Munar (ESP) 7-6 (7/1), 6-4, 6-4
Fernando Verdasco (ESP x30) bt Guido Andreozzi (ARG) 6-3, 6-2, 6-2
Women
1st round
Simona Halep (ROM x1) bt Alison Riske (USA) 2-6, 6-1, 6-1
2nd rd
Katerina Siniakov (CZE) bt Kateryna Kozlova (UKR) 6-7 (4/7), 6-4, 6-4
Barbora Strycova (CZE x26) bt Ekaterina Makarova (RUS) 6-4, 6-2
Naomi Osaka (JPN x21) bt Zarina Diyas (KAZ) 6-4, 7-5
Mihaela Buzarnescu (ROU x31) bt Rebecca Peterson (SWE) 6-1, 6-2
Elina Svitolina (UKR x4) bt Viktoria Kuzmova (SVK) 6-3, 6-4
Petra Kvitova (CZE x8) bt Lara Arruabarrena (ESP) 6-0, 6-4