The injury standing in Rafa Nadal way

Rafa Nadal has suffered a number of career-threatening injuries in the past yet a bad blister on the Spaniard's hand could be all Roger Federer needs to gain a vital advantage in their Australian Open semi-final.

Rafael Nadal of Spain receives medical treatment to a blister on his hand during his quarterfinal against Grigor Dimitrov of Bulgaria at the Australian Open tennis championship in Melbourne, Australia. (AP)

(AP)

Rafael Nadal of Spain celebrates his win over Grigor Dimitrov of Bulgaria during their men's singles match on day 10 of the 2014 Australian Open tennis tournament in Melbourne. (AFP)

(AFP)

(AFP)

(AFP)

Rafael Nadal of Spain, right,  hugs Grigor Dimitrov of Bulgaria after Nadal won their quarterfinal  in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia. (AP)

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