World No 1 says tennis needs to change amid rumours of rebel tourSerbia star is in Perth for United Cup ahead of Australian Open
World No 1 Novak Djokovic says tennis needs to innovate, but that he remains in the dark about a potential rebel tour.
Rumours are growing that a LIV Golf-style elite tennis tour could be launched, possibly as early as 2025, to rival the ATP and WTA tours.
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