Djokovic starts 100 double jump rope challenge

Previously, we've seen a lot of interesting challenges. Roger Federer created a volley challenge, Andy Murray a 100 volley challenge with his wife. Now, Novak Djokovic also started his own challenge. The point of the challenge is to do 100 double jumps on the rope. The Serbian nominated his colleagues from the Davis Cup team, Dusan Lajovic and Filip Krajinovic but also Janko Tipsarevic and Nenad Zimonjic.

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