By Scott Trotter World No.1 Novak Djokovic has added his voice to those hoping tennis legend Rafael Nadal can make it to the French open this year. The Serbian star has declared it important to tennis that Nadal features, with the Spaniard expected to end his career at the end of this season. The 14-times Roland Garros winner was forced to pull out of the Monte Carlo Masters as he continues to deal with injury issues that saw his comeback cut short earlier this year. Djokovic is set to face Roman Safiullin or a qualifier in the second round of the Monaco tournament and was broached to speak ab…