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Can Roger Federer add to 20 grand slam titles?

(CNN)With the impact of bushfire smoke dominating the buildup to the Australian Open, it's easy to forget what might happen on the court.The familiar trio of Rafa Nadal, Novak Djokovic and Roger Federer -- boasting 55 grand slam titles between them -- lead the men's draw, with Djokovic arguably the favorite given his unmatched record in Melbourne.The Serb is hoping to add to his unparalleled haul of seven Australian Open titles, while top-ranked Nadal has been victorious here just once, back in 2009.Visit CNN.com/sport for more news, videos and featuresAs for Federer, this could be the last time we see him at Melbourne Park. Now 38, the Swiss great has been coy on his retirement plans but did confirm last year that we will see him at the T ...