Djokovic has a rival in Australia: what will happen if he cannot play?
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(CNN) --
Novak Djokovic's Australian visa has been revoked for the second time, nearly ending the world's No. 1 men's ambitions to contest the Australian Open and win his record 21st Grand Slam.
It is unclear if Australia will take steps to deport the Serbian star, as his legal team may still challenge the decision.
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Novak Djokovic