 Complete the following phrase:  Novak Djokovic and Nadal have met 58 times more than any other pair in the Open Era and Nadal leads 107 at the Grand Slams and trails 2830 overall. They have played a joint-record 17 Grand Slam matches tied with DjokovicFederer and a joint-record nine Grand Slam tournament finals tied with NadalFederer. Nadal leads on clay 198, while Djokovic leads on hard courts 207, and they are tied on grass 22. In 2009, this rivalry was listed as the third greatest of the previous 10 years by ATPworldtour.com. Djokovic is one of only two players to have at least ten match wins against Nadal the other being Federer and the only person to defeat Nadal seven consecutive times, and two times consecutively on clay. The two earlier shared the record for the longest match played in a best of three sets 4 hours and 3 minutes at the 2009 Mutua Madrid Open semifinals until the match between Roger Federer and Juan Martín del Potro in the 