Selected 1st round matchesDjokovic   vs     StaraceKavcic         vs     Hewitt         Seppi        vs     DavydenkoDarcis        vs     Verdasco     Simon        vs     Harrison     Federer     vs     Kamke         Ungur        vs     Nalbandian     Mahut        vs     Roddick     Del Potro  vs     Montanes         PARIS - Novak Djokovic admits Rafael Nadal is the favourite for the French Open - but is up for the challenge of completing a historic Grand Slam sweep in Paris.The world number one is bidding to be the first man since Rod Laver in 1969 to hold all four major trophies. But reigning champion Nadal is going for an unprecedented seventh title."He is always favourite here,” said Djokovic. "This is an opportunity very few tennis players will get. I’m aware of that but accept it as a challenge.”Only Laver, twice, and Don Budge in 1938 have held all four major titles at the same time, both having completed the Grand Slam of all four in a single year.The Serb, who already has the Wimbledon, US Open and Australian Open crowns in his possession and plays Italy’s Potito Starace in the first round, added: "It makes me even more motivated."It makes me feel good about it, rather than feeling pressured and worried if something bad is going to happen. So I’m looking forward to that.”Third seed Roger Federer, who begins his challenge against Germany’s Tobias Kamke, believes it is Nadal who will be making history at Roland Garros, rather than Djokovic."Rafa is the favourite for me,” said Federer, the 2009 champion in Paris. "I think he has lost only two sets between Rome, Monte Carlo and Barcelona, so that’s a pretty good start.Since Laver’s 1969 achievement, only Pete Sampras, Federer and Nadal have had opportunities to complete a non-calendar year Grand Slam.Sampras lost to Jim Courier in the quarter-finals at Roland Garros in 1994; Federer lost to Nadal in the final at the 2006 and 2007 French Open while Nadal lost to David Ferrer in the quarter-finals at the 2011 Australian Open.The Spaniard, who starts his defence against Italy’s Simone Bolelli, said: "Every tournament is difficult but this one is not going to be more difficult because he [Djokovic] has already won three.