The ATP Dubai Open Men's Tennis Championship get underway in Dubai today. World Number One Novak Djokovic and the defending champion Roger Federer are all set to repeat their on court rivalry at the Dubai Duty Free Tennis Stadium at the weeklong tournament. Looking for his sixth title in Dubai; Roger Federer will take on the wild card entry ,Tunisia's Malek Jaziri in the first round today. Novak Djokovic begins his quest for the fourth title tomorrow against the fellow Serbian Viktor Troicki. India's Somdev Devvarman plays Igor Kunitsyn in the opening round today. Djokovic and Federer have got the first two rankings in the tournament. Djokovick stands favorite having won his third consecutive Australian Open last week defeating Andy Murray. The tournament also features Tomas Berdych, Jo-Wilfried Tsonga and Juan Martin Del Potro, all of whom have the potential to cause an upset.