Novak Djokovic dropped to a crouch, his hands on his knees. He then appeared to wipe away tears with his forearm before pointing with both hands to the sky. Alexandr Dolgopolov, his beaten opponent, stood at the net and applauded.
Djokovic had just finished his third-round match at the Monte Carlo Masters yesterday, hours after learning of his grandfather's death. He skipped the post-match news conference, with the ATP saying he "just felt totally exhausted physically, mentally and emotionally".
Djokovic defeated Dolgopolov 2-6, 6-1, 6-4. He reached the quarter-finals along with Rafael Nadal, Andy Murray, Jo-Wilfried Tsonga, Tomas Berdych and Gilles Simon.
Nadal, the seven-time defending champion, followed Djokovic on court and routed Mikhail Kukushkin 6-1, 6-1. Nadal conceded only six points on his serve and broke the Kazakh qualifier five times. He will next face Switzerland's Stanislas Wawrinka, who defeated eighth-seeded Nicolas Almagro of Spain 6-3, 6-3.
Third-seeded Murray advanced after Julien Benneteau of France injured his ankle and quit near the end of a tight first set with the score 6-5. He said later he had a broken right elbow and sprained right ankle.