Roger Federer congratulates Rafael Nadal after his record 20th Grand Slam title

After Rafael Nadal equalled Roger Federer's record for most number of Grand Slam titles -- 20 -- on Sunday night, the former world No.1 Swiss took to twitter to congratulate his long-time rival.

Nadal on Sunday won the French Open for the 13th time, his 20th Grand Slam title, to match Federer's record. The Spaniard defeated...