Wimbledon  entered the twilight zone yesterday as Serena Williams  became the latest high-profile champion to fade into oblivion at a tournament where reputations and star status are counting for nothing. Just when it seemed that this year's grasscourt major had exhausted its quota of shocks with Grand Slam champions Rafa Nadal, Roger Federer, Maria Sharapova and Victoria Azarenka all blotted out of the draw by the second round, along came Sabine Lisicki. The German, playing a brand of fearless tennis, jettisoned American holder Williams 6-2, 1-6, 6-4 to leave Wimbledon gasping in disbelief once again. "I'm still shaking, I'm so happy," gulped a tearful Lisicki, who fell flat on her stomach in her moment of triumph. "It's amazing, I love this court so much. It's unbelievable!" It certainly was unbelievable because even before the first-week exodus of big names, top seed Williams had been the overwhelming favourite to win a sixth title having triumphed at three of the last four majors. She also walked on court on a 34-match winning streak but her exit left world number four Agnieszka Radwanska as the highest seed and Czech Petra Kvitova as the only former champion still alive in the women's draw. "It's not a shock. I didn't do what I do best," summed up Williams who won nine games on the trot to take a 3-0 lead in the final set. While Williams was left to pack away her orange hotpants, world number 24 Lisicki proved that her game usually catches fire at Wimbledon where she has reached at least the quarterfinals in her last four appearances. "Sabine was on today. She's always on against big players and big courts. She just has a super, super game to play well on grass," added Williams. Meanwhile, top seed Novak Djokovic continued his stroll through the top half of the Wimbledon draw with a 6-1 6-4 7-6(4) victory over Tommy Haas to reach the quarter-finals yesterday. The Serb, bidding for a second title at the All England Club, is yet to drop a set, although he did have a hiccup when he trailed in the second against 35-year-old German Haas. Haas, blown off court in a 25-minute opening set, raised his game to break in the fifth game of the second set but Djokovic hit back to level at 4-4 with a crosscourt backhand winner. Normal service was soon resumed as Djokovic took the second set and moved 5-2 ahead in the third but Haas managed one last counter - attack to stretch the contest into a tiebreak. With the light fading Djokovic slammed the door shut to roll on. Murray survivesMen's second seed Andy Murray is another player who feels at home on the lush green turf and he survived a second-set wobble to take care of Russian Mikhail Youzhny 6-4, 7-6(5) 6-1. Eighth seed Kvitova dispatched Spaniard Carla Suarez Navarro 7-6(5), 6-3 to set up a last-eight meeting with Belgian Kirsten Flipkens and Radwanska made it a good day for Poland by outlasting Bulgaria's Tsvetana Pironkova 4-6, 6-3, 6-3. William's downfall also meant that Sloane Stephens was the only American, man or woman, to reach the quarterfinals. The 20-year-old lived up to her potential by beating Puerto Rican teenager Monica Puig 4-6, 7-5, 6-1. At the other end of the age spectrum, China's Li Na proved that 31-year-olds can still do damage on grass by thrashing Italian 11th seed Roberta Vinci 6-2, 6-0. Britain had been anticipating a double celebration as for the first time since 1998, home interest was still alive in both singles draws on the second yesterday. But hopes that US Open winner Murray and Laura Robson would both reach the last eight were dashed when the 19-year-old Robson bowed out 7-6(6), 7-5 to Kaia Kanepi. The road to the final opened up for Murray following the demise of Federer and Nadal and having played the highest seed he can face before the final, number 20 Youzhny, expectations that he will end Britain's 77-year wait for a men's Wimbledon champion are rocketing. Standing in Murray's way next is world number 54 Fernando Verdasco. Gentle giant Juan Martin Del Potro made it through to his first Wimbledon quarterfinal and will face fourth seed David Ferrer.