Novak Djokovic of Serbia celebrates during the men's singles third round match against Roberto Bautista Agut of Spain at the French Open Tennis Tournament 2018 in Paris, France on May 31, 2018. Novak Djokovic won 3-1. (Photos: Xinhua)

Novak Djokovic of Serbia celebrates after winning the men's singles third round match against Roberto Bautista Agut of Spain at the French Open Tennis Tournament 2018 in Paris, France on May 31, 2018. Novak Djokovic won 3-1.