World number one Andy Murray made a shock second-round exit at the BNP Paribas Open at Indian Wells, losing 6-4 7-6 (7-5) to qualifier Vasek Pospisil.

The Briton, who had a first-round bye, was sluggish throughout the match against the Canadian world number 129.

Murray, 29, was broken four times as he struggled with Pospisil’s serve-and-volley style.

It was the first victory for Pospisil, 26, in five meetings with Murray.

Although a qualifier, Pospisil has been ranked as high as 25th in the world and beat both Kyle Edmund and Dan Evans in Britain’s Davis Cup victory over Canada in February.

After Murray took a 4-2 lead early on, the Canadian hit back to win six successive games, claiming the first set before finally winning the second 7-5 in a tie-break, hitting a cross-court winner on his fourth match point.

“It was obviously a disappointing one as I had opportunities in the first set but I didn’t serve well enough,” Murray told BBC Sport.

“I served a few double faults, especially in the first set at important moments, which didn’t help things.

“He definitely started to play better in the second set, he was being aggressive and coming to the net and played some great reflex volleys at important moments and deserved to win.”

Murray claimed his maiden Dubai Championships title last week, but his defeat continues a poor run at Indian Wells, having lost in the third round last year. His best result at the tournament was when he was runner-up to Rafael Nadal in 2009.