Novak Djokovic wins French Open title to win fifth crown of 2011 . Straight sets win over Feliciano Lopez extends his unbeaten streak to 27 - 0 . Juan Martin del Potro wins Estoril Open by defeating Fernando Verdasco in final . Nikolay Davydenko of Russia wins ATP title in Munich .
Novak Djokovic wins Serbia Open title to claim fifth crown of 2011 . Straight sets win over Feliciano Lopez extends his winning run to 27-0 . Juan Martin del Potro wins Estoril Open by beating Fernando Verdasco in final . Nikolay Davydenko of Russia wins ATP title in Munich .