Novak Djokovic may not play again until the Olympics after having his grand slam hopes sensationally scuppered by American Sam Querrey in the third-round of Wimbledon.

The world number one had been trying to become the first man since Rod Laver in 1969 to win all four major trophies in the same year.

Djokovic says he may not return to the court until next month's Rio Games.

He says it's been a very successful year, but a very exhausting one and he needs some rest.

Former champion Petra Kvitova has also been knocked out, but the likes of Andy Murray, Kei Nishikori and Simona Halep have all advanced.