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"When you know he's hurting, all you want to do is deliver that knockout blow" - When Novak Djokovic retired at Australian Open against Andy Roddick
Novak Djokovic came into the 2009 Australian Open as the defending champion, and was among the favorites to win the tournament, alongside the likes of Roger Federer, Rafael Nadal and Andy Murray.
Novak Djokovic vows to strive for more Grand Slam titles at age 37 after his latest injury
It could be tempting to write off Novak Djokovic at this point, to think he might be closer than ever to being done competing ...