With the likes of Rafael Nadal, Andy Murray, Andy Roddick, Juan Martin Del Potro, Justine Henin and Dinara Safina, Sunday is set to break today's record day time crowd of 49,395, the highest day time crowd ever at Australian Open.

Sunday will open up on Rod Laver Arena with round four action, when Murray, the fifth seed, meets big hitter John Isner, No.33, from America. These players have never played each other but Murray has been in blistering form all week and will be looking to get one step closer to becoming the first British man in 74 years to win a Grand Slam title.

Following that match the world's No.2 Nadal will clash with Croatia's No.39 Ivo Karlovic. The defending Australian Open men's champion, Nadal, is leading the heads to heads 2-0 with their last meeting at Queen's Club, London in 2008.

As night descends on Rod Laver Arena it is an all Belgian show down when Grand Slam champion and comeback queen, Henin, takes on fellow countrywoman Yanina Wickmayer. Both have had outstanding form coming into the tournament with Henin 4-1 since the start of the year and Wickmayer undefeated on a 5-0 winning streak.

Closing out the first week of tennis action on Rod laver Arena is Brisbane International champion and No.7 seed Roddick. Taking on Chilean Fernando Gonzalez, the two have met eleven times with Roddick currently leading 8-3. The winner of this match will take on either Del Potro or his opponent No.14 seed Marin Cilic from Croatia who meet each other in the third match on Hisense Arena tomorrow.

Other Hisense Arena matches will see Moorilla Hobart International champion Alona Bondarenko take on Zheng Jie followed by all Russian fourth round women's action with Nadia Petrova meeting Svetlana Kuznetsova and Maria Kirilenko meeting Safina.