Champion Nadal into fourth round

Nadal has already accumulated six Grand Slam titles Defending champion Rafael Nadal advanced to the fourth round of the Australian Open with a 6-4 6-2 2-6 7-5 win over German Philipp Kohlschreiber. The second seed's serve was put under pressure and he needed some inventive shots to win in three-and-a-half hours. Fourth seed Juan Martin del Potro survived some anxious moments before beating the unseeded Florian Mayer. The 21-year-old US Open champion served 11 aces but was guilty of 46 unforced errors in a 6-3 0-6 6-4 7-5 victory. Nadal extended his record against Kohlschreiber to 5-0 but it was their closest match to date, and in statistical terms only eight points separated them over the 38 games. "Well, the most important thing is I won, so I'm happy for that," the 22-year-old said. "I am less happy about my game, what I was practising. But everybody has not very good days. "I think I played much better the fourth set. The second set for a few moments I played well, too. But the first set and the third, I played bad and I need to play a little bit more aggressive for my next match." That will be against the gargantuan Croatian Ivo Karlovic, who beat compatriot Ivan Ljubicic 6-3 3-6 6-3 7-6. for more : http://news.bbc.co.uk/sport2/hi/tennis/8474055.stm