Novak Djokovic was surprisingly upbeat after his shock Indian Wells defeat at the hands of Botic van de Zandschlup - but his smile has left some onlookers concerned

Novak Djokovic was all smiles in his press conference after being knocked out of Indian Wells by Botic van de Zandschlup, with former pro CoCo Vandeweghe questioning his mental state

Novak Djokovic suffered his third successive defeat after bowing out of Indian Wells via a shock loss to Botic van de Zandschlup.

Novak Djokovic was all smiles in his post-match press conference after a shock defeat at Indian Wells, but his reaction to the loss has raised suspicions over his mental state