Australian Open 2012: Roger Federer defeats Juan Martin Del Potro in straight-sets to reach Melbourne semi-finals The Swiss, a four-time Australian Open winner, looked close to his best as he brushed aside Del Potro 6-4, 6-3, 6-2 to set up a possible meeting with Rafael Nadal should the Spaniard beat Tomas Berdych in their quarter-final meeting. It turned out to be the key game in the match as, from two sets down, a Del Potro comeback never looked likely. The 2009 US Open champion was broken again in the opening game of the third and then again for 5-2 as Federer cruised home in ihis 1,000th tour-level match. "I am happy, I thought it was a great match," he said. It was tough with the sun and the shade creeping across the court but I thought it was a really high quality match. Juan Martin is a great player and I knew how hard he could hit the ball so I tried to manoeuvre him round a little bit.