Juan Martin del Potro consoled his 2017 French Open opponent Nicolas Almagro after the Spaniard quit their second round match in tears with a knee injury.
Del Potro helped a sobbing Almagro from the court and will now face Britain’s Andy Murray in the third round.
Argentina’s Del Potro is playing in his first French Open since 2012 having suffered a series of injuries.
“I wish you a speedy recovery. I can imagine what you are feeling. Strength,” tweeted Del Potro.
World number one Murray came from a set down to beat Martin Klizan.
Elsewhere, third seed and former champion Stan Wawrinka progressed to round three with victory over Ukraine’s Alexandr Dolgopolov.
The Swiss, 32, won 6-4 7-6 (7-5) 7-5 against the world number 89.
But 13th seed Tomas Berdych has been knocked out, losing 7-5 6-4 6-4 to world number 53 Karen Khachanov.
Controversial Australian 18th seed Nick Kyrgios is also out after he was beaten 5-7 6-4 6-1 6-2 by South African Kevin Anderson.
Seventh seed Marin Cilic reached the third round with a 6-3 6-2 6-2 win over Russia’s Konstantin Kravchuk.
Japan’s Kei Nishikori, the eighth seed, progressed by beating Jeremy Chardy 6-3 6-0 7-6 (7-5).
In the women’s draw, fifth seed Elina Svitolina came from behind to beat Tsvetana Pironkova 3-6 6-3 6-2.
Ninth seed Agnieszka Radwanska also dropped the first set but recovered to win 6-7 (3-7) 6-2 6-3 against Alison Van Uytvanck.