ISLAMABAD, October 12 (online): Roger Federer congratulated Rafael Nadal on the latter’s 20th Grand Slam win on Sunday even as Nadal equalled Federer’s all-time record of most Grand Slam titles. Nadal defeated World No. 1 Novak Djokovic 6-0, 6-2, 7-5 at Court Philippe Chatrier to win his 13th French Open title. “I have always had the utmost respect for my friend Rafa as a person and as a champion. As my greatest rival over many years, I believe we have pushed each other to become better players,” Federer wrote on Twitter.