Dubai: When Rafael Nadal claimed his 13th French Open crown in typically one-sided fashion against Novak Djokovic on Sunday to finally peg back Roger Federer in the Grand Slam race, one of the first to congratulate the Spaniard was the Swiss former world No. 1 himself. Having led his younger rival and friend in the Grand Slam title race for nearly two decades — Nadal turned pro in 2001, three years after Federer — they are now tied on an astounding 20-20 in Grand Slam crowns.