Federer gains quarterfinals - UPI.com Switzerland's Roger Federer returns in his match against Belgium's Xavier Malisse on the seventh day of the 2012 Wimbledon championships in London, July 2, 2012. Updated July 2, 2012 at 12:44 PM Published: July 2, 2012 at 12:25 PM LONDON, July 2 (UPI) -- Six-time champion Roger Federer moved to the quarterfinals at Wimbledon Monday with a four-set win over Xavier Malisse. Federer, seeded third, defeated the Belgian 7-6 (7-1), 6-1, 4-6, 6-3 in a 2-hour, 11-minute match that had a brief rain delay. Federer was treated for an aching back while holding a 4-3 lead in the first set. He later said his back was OK. It was the 850th win of the 30-year-old Swiss star's career and marked the 33rd straight time he has reached the quarters in a Grand Slam. Federer's next foe will be the 26th seed, Russian veteran Mikhail Youzhny, who advanced with a hard-fought 6-3, 5-7, 6-4, 6-7 (5-7), 7-5 win over Uzbekistan's Denis Istomin. Federer is trying for his first win in a major since the 2010 Australian Open.