Novak Djokovic, left, of Serbia walks with former Grand Slam champion and coach Boris Becker of Germany during a training session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 12, 2014. (AP Photo/Eugene Hoshiko)

Australian Open Tennis

Novak Djokovic, left, of Serbia walks with former Grand Slam champion and coach Boris Becker of Germany during a training session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 12, 2014. (AP Photo/Eugene Hoshiko)

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