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, who was ousted in the third round last year, fell 6-2, 3-6, 6-1 to Botic Van De Zandschulp in the second round of the BNP Paribas Open on Saturday.

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