Juan Martin Del Potro thinks Lionel Messi's achievement is greater than Novak Djokovic

When asked which one was more impressive - Novak Djokovic’s 40 consecutive victories last year or Lionel Messi’s 73 goals this season, Juan Martin Del Potro thought Messi's achievement is greater.

Del Potro, a football fan said no one will ever be able to repeat or surpass Messi's number of goals.

(Via French Open website)