LEWES, England (AP) Tennis coach Nigel Sears says his collapse at the Australian Open was down to some bad sushi, not heart problems.

Sears, who coaches Ana Ivanovic, blacked out during the Serbian player's third-round match last month with Madison Keys of the United States.

Sears, whose daughter Kim was expecting a baby with husband Andy Murray, was taken to the hospital in Melbourne. Tests in Australia and Britain, where he lives, indicated his heart is fine.

He told The Times on Wednesday: ''I had sushi for lunch 10 days in a row in Melbourne and was fine. But I suppose the law of averages dictates you get one dodgy bit of raw fish in that time.''

Murray lost to Novak Djokovic in the final before dashing home for his daughter's birth.