Novak Djokovic is favored to win the Australian Open based on his defending champion status, 21 match winning streak at the event, and favorable draws against opponents he has strong head-to-head records against. Rafael Nadal is also considered a top contender but may face challenges from Federer or Murray in the semifinals on a surface less favorable to his game. Andy Murray is an outsider due to lacking match sharpness following recent back surgery, though he has a kind draw. Juan Martin del Potro and Jo-Wilfred Tsonga are also seen as potential threats who could make deep runs in the tournament.