Nick Kyrgios' off-court feud with Serbian ace Novak Djokovic is known to all. The outspoken Aussie hit back at Novak's criticism and called him a "very strange cat".

'He's a very strange cat': Nick Kyrgios hits back at Novak Djokovic

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'He's a very strange cat': Nick Kyrgios hits back at Novak Djokovic