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Serbia's Novak Djokovic impersonates his coach and former Grand Slam champion Boris Becker's service action following his fourth round win over Italy's Fabio Fognini at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014. (AP Photo/Eugene Hoshiko)

Serbia's Novak Djokovic impersonates his coach and former Grand Slam champion Boris Becker's service action following his fourth round win over Italy's Fabio Fognini at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014. (AP Photo/Eugene Hoshiko)

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