Fernando Meligeni launches a Twitter challenge involving Rafael Nadal, Novak Djokovic and Roger Federer. The former Brazilian tennis player, semifinalist of the Roland Garros in 1999 and currently sports commentator, took a poll on his social profile regarding the Big 3 of tennis. “Suppose your life depends on one of the three. It would depend on a game, a field, a challenge. Djokovic, Nadal or Federer. Their victory would save you. Who would you choose? Why?” This is the question that the former number twenty-five in the world left to his followers. While the survey was in progress, a user asked Meligeni what he would vote on his own question. “You asked and I will answer, …