( CNN ) -- Rafael Nadal is on track to win his fourth successive grand slam after Marcos Daniel was forced to retire during their first-round match at the Australian Open on Tuesday . World number one Nadal had already opened up a 6-0 5-0 lead before the Brazilian suffered a knee injury after 47 minutes of the match . Nadal , a nine-time major winner , is hoping to become the first player since Rod Laver in 1969 to win four consecutive Grand Slams . `` I think I played right , '' the 24-year-old told the ATP Tour 's website ahead of his next match against American debutant Ryan Sweeting , who is ranked 116th . `` I played some good shots , some long shots . The serve can be a little bit better . That 's the only point that I think I can improve . '' The Australian Open should be in February ! British fifth seed Andy Murray progressed to round two after his opponent also became injured . Murray , who was a beaten finalist in Melbourne last year , led Slovakia 's Karol Beck 6-3 6-1 4-2 when the world number 101 succumbed to a shoulder problem . The match lasted for one hour and 42 minutes before Beck withdrew , meaning the 23-year-old Murray will now face Illya Marchenko of the Ukraine who beat Spain 's Ruben Ramirez Hidalgo . `` I thought it was a pretty good match , '' said Murray . `` Obviously you 'd rather finish the match off without your opponent being hurt , but it does happen quite a lot . So you just have to move on and get yourself ready for the next round . '' Juan Martin del Potro scored a victory on his return to Grand Slam action , as he defeated Israel 's Dudi Sela 7-6 6-4 6-4 . Argentina 's Del Potro , the 2009 U.S. Open champion , has not played in one of the four majors since last year 's Melbourne Park tournament after struggling with a wrist injury . `` Today I played good tennis again , '' the former world number four said . `` But I 'm really enjoying this week . I met with all the players , especially the top-10 players . They supported me when I was very bad . So now I am face to face with them I can say thank you . '' Del Potro will now play the 2006 Australian Open champion Marcos Baghdatis , who beat Slovenia 's Grega Zemlja 3-6 7-5 6-1 4-6 6-2 . Australia 's Lleyton Hewitt and David Nalbandian of Argentina played out a five-set clash which lasted four hours and 48 minutes at the Rod Laver Arena in a rematch of the 2002 Wimbledon final . Nalbandian eventually sealed a 3-6 6-4 3-6 7-6 9-7 victory , with the final set lasting 93 minutes , as he avenged that defeat and also his reverse to Hewitt in the 2005 Austalian Open quarterfinals . Lithuania 's Ricardas Berankis will be Nalbandian 's second-round opponent after he beat another Australian Marinko Matosevic 6-4 6-2 7-5 . France 's Jo-Wilfried Tsonga came from two sets down to claim a 4-6 2-6 6-2 6-3 6-4 triumph over Philipp Petzschner of Germany . Tsonga , seeded 13th , eventually won the match after 194 minutes to set up a tie against Andreas Seppi after the Italian defeated Arnaud Clement . America 's John Isner hit 26 aces on his way to a 6-3 7-6 6-3 win over Florent Serra of France . Isner is set to face Radek Stepanek of the Czech Republic in the second round , who advanced at the expense of Deni Gremelmayr .
Rafael Nadal is into the second round of the Australian Open after Marcos Daniel retired . Andy Murray is through after Karol Beck was also forced to retire in their match . He is joined in the next round by Argentina 's Juan Martin del Potro , who beat Dudi Sela . Marcos Baghdatis , John Isner and Radek Stepanek all scored victories in Melbourne .