Novak Djokovic and Nadal have met 58 times (more than any other pair in the Open Era) and Nadal leads 10–7 at the Grand Slams and trails 28–30 overall. They have played a joint-record 17 Grand Slam matches (tied with Djokovic–Federer) and a joint-record nine Grand Slam tournament finals (tied with Nadal–Federer). Nadal leads on clay 19–8, while Djokovic leads on hard courts 20–7, and they are tied on grass 2–2. 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 London 2012 Olympics Semifinal, which lasted 4 hours and 26 minutes. They have also played in a record 14 ATP Masters finals.