Rafael Nadal 'one of the biggest challenges' claims Novak Djokovic - Tennishead
Novak Djokovic explains his Madrid Masters withdrawal - Tennis World USA
Rafael Nadal: 'Andy Murray was on the same level as Novak Djokovic, Roger Federer and me' - MSN
'It's paramount challenge to play Rafael Nadal in Roland-Garros': Novak Djokovic - mid-day.com
In the shadow of Rafael Nadal: Where does Novak Djokovic rank in the clay GOAT debate? - Sportskeeda
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