Novak Djokovic feeds off the negative energy towards him – John McEnroe

Novak Djokovic was jeered by the crowd (Christophe Ena/AP)

John McEnroe has warned the French Open fans that booing Novak Djokovic will only spur him on when he plays crowd favourite Rafael Nadal on Tuesday night.

World number one and defending champion Djokovic was jeered when he walked on to court before his fourth-round match against Diego Schwartzman.