Novak Djokovic has said that he is expecting his Australian Open semi-final with Stanislas Wawrinka to be a "marathon".
Djokovic booked his place in the last four with a straight-sets win over Milos Raonic, and he is hoping to exact revenge on Wawrinka, who knocked him out in the quarter-final last year.
He told Jim Courier on court: "I'm expecting a marathon like the last couple of years and I'm sure the both of us will give our best to perform the best possible tennis. We always ask each other the most of our abilities and entertain the crowd."
Defending champion Wawrinka beat Kei Nishikori in the quarter-finals.
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