PARIS (AFP) Defending champion Roger Federer showed no mercy to Stanislas Wawrinka on Sunday, handing his Olympic gold medal-winning teammate a French Open hiding as Andy Murray made an angry Roland Garros exit. World number one Federer beat close friend Wawrinka 6-3, 7-6 (7/5), 6-2 and nows faces Robin Soderling, the Swedish fifth seed who he defeated in the final last year. But his efforts were overshadowed by Czech 12th seed Tomas Berdych who sent British fourth seed Murray to a shock 6-4, 7-5, 6-3 defeat. Berdychs reward is a last eight clash against Russias Mikhail Youzhny who went through when final French hope Jo-Wilfried Tsonga retired injured after losing the first set of their clash. Murray, a quarter-finalist in 2009, was furious that his match was concluded at 2130 (1930GMT) in fading light and after the tie had already suffered a 40-minute rain delay. Berdych had won the first set 6-4 with Murray ahead 4-3 in the second when play was halted for rain at 2000 (1800 GMT) and most fans had already left Court Suzanne Lenglen believing that the match would conclude on Monday. But play resumed despite the dank surroundings and Murray never settled, arguing constantly with officials as well as berating himself. It was frustrating. I struggled after the rain delay, said Murray, who was keen not to blame the gloomy atmosphere for his loss. They put a lot of clay on the baseline and service line during the delay, but at the back of the court it was slippy and I lost my footing a few times. But I dont want to make excuses. They were tough conditions but he just handled them better than me. Berdych added: There was the delay and the darkness, maybe I handled it better. My coach told me that Andy looked like he didnt want to play. Soderling sent four-time champion Rafael Nadal crashing to a shock defeat in 2009 on his way to a first Grand Slam final, but Federer will be buoyed by his record of 12 wins in 12 matches against the Swede when they meet on Tuesday. Soderling reached the quarter-finals with a brutal 6-4, 6-4, 6-2 demolition of Croatian 10th seed Marin Cilic. Federer has reached the quarter-finals without losing a set and is widely expected once again to be facing Nadal in the final next weekend, but he was refusing to get carried away by his smooth progress. I could have lost a set against Alejandro Falla in the second round and today against Stan and after this, you never know, said Federer. So I am happy with whats happened. Im playing well, serving well and moving well. I hope it continues like this. Wawrinka, who teamed up with Federer to win 2008 Olympic gold in Beijing in what he described as the greatest night of his life, picked up a code violation for angrily smashing his racquet into the Paris clay as he slipped to defeat. Frustration. Nothing but frustration, said Wawrinka. French hopes of a first mens champion since Yannick Noah in 1983 fizzled out when eighth-seeded Tsonga was forced to retire with a suspected groin injury. Youzhny had won the first set 6-2 before the Frenchman, who had entered Court Philippe Chatrier with a flamboyant clenched-fist gesture, needed treatment on his injury and then quit before the start of the second set. Tsonga was jeered off court by some sections of the crowd following his 31-minute stay. I can understand that people are disappointed, but I can look myself in the mirror. I know I did my best. If I have an injury, its not my fault, he said. Serena too good for Peer Top seed Serena Williams marched into the French Open quarter-finals on Monday with a dominating 6-2, 6-2 win over Israels Shahar Peer. She will next play Belgiums Justine Henin should the four-times former champion get past Samantha Stosur of Australia who were playing their fourth round tie out on the Suzanne Lenglen showcourt. I am so happy she is playing again, Williams said of Henin. I would love to play her here again. The American, who was champion here in 2002, lost the first seven points of the match as she struggled to get to grips with the cold, blustery conditions out on the Philippe Chatrier centre-court. But she promptly won the next nine as she moved up the gears and then broke Peer for a second time to take a 4-2 lead. Williams held comfortably to make it 5-2 and then captured the Peer serve for a third straight time to take the first set in just 28 minutes. Williams squandered three break points to go 2-0 up in the second and had to save two of her own in the following game as the Israeli battled valiantly from behind the baseline to cope with her opponents greater weight of shot. There were no signs of the sickness that had affected Williams in her third round tie against Anastasia Pavlyuchenkova with sister Venus and her mother and father lending family support from the players section. Williams continued to dominate the rallies and Peer cracked once again in the fourth game hitting a forehand marginally long to hand Williams the break and a 3-1 lead. Peer took advantage of a sloppy game from the American to break back in the following game, but she promptly gave that back as Williams pinned her back with her heavy groundstrokes. From there on in Williams coasted in winning the last eight points of the matc as Peer wilted. The days two remaining fourth round ties sees a second Australian, in the shape of Jarmila Groth, play Yaroslava Shvedova of Kazakhstan with the winner playing either fourth seed Jelena Jankovic of Serbia or Slovakian veteran Daniela Hantuchova for a place in the semi-finals.