Djokovic's demise leaves door open for Murray TWO-time defending champion Novak Djokovic suffered a shock defeat at the hands of Tommy Haas to leave Andy Murray in the box seat at the Sony Open in Miami. Veteran German Haas completely outplayed the world No 1 for a 6-2, 6-4 victory meaning Murray, who earlier beat Andreas Seppi by the same scoreline, is the highest seed left in the tournament going into the quarter-finals. From 2-1 down in the first set, Haas won seven straight games to go 6-2, 2-0 up and, though Djokovic eventually broke back to level, the 34-year-old held on for his first victory against a world number one since 1999. In distinctly chilly conditions in the late match, there were hints of what was to come as Haas held his first two service games to love. Haas then sealed the first break of the match as Djokovic netted, and the Serbian handed him another with a poor shot at the net. The 15th seed took the first set in less than half an hour, then kept on rolling with a break to open the second, in part thanks to a double fault by his opponent. Djokovic saved break points in his next service game too, before holding to stop the rot, then pounced on some rare unforced errors by Haas to seal a break of his own and level at 3-3. Haas broke again though at 4-4 and it proved decisive as he sealed the match at the second attempt with a forehand winner. The German's prize is a last-eight meeting with 11th seed Gilles Simon, who beat Janko Tipsarevic in three sets. Murray breezed into the quarter-finals, where he will face Marin Cilic today, after cruising past 16th seed Seppi. Murray has yet to drop a set in this tournament and this did not seem likely to change on Tuesday as he was rarely tested by his Italian opponent, whose sole break point opportunity came in the final game. The Briton felt the windy conditions worked to his advantage. "It was swirling a little bit at the start and he made more unforced errors than he usually does," he said."I was able to track down a lot of his balls because he wasn't timing his shots that well. But he started going for his shots more in the second set and made it tough for me. There were also wins for the third and fourth seeds, David Ferrer and Tomas Berdych, as well as Richard Gasquet and Jurgen Melzer. Four-time runner-up Maria Sharapova overcame an uneven performance at the Sony Open to reach the semi-finals yesterday by beating Sara Errani 7-5, 7-5. The Russian made 57 unforced errors, including 13 double-faults, and had to save three set points in the second set. Sharapova completed a career Grand Slam last year but has never won in Key Biscayne. She is bidding to become the third woman to win Indian Wells and Key Biscayne in the same year, joining Steffi Graf and Kim Clijsters. Britain's Laura Robson, meanwhile, put her second-round singles loss to Alize Cornet behind her as she and new American partner Lisa Raymond reached the semi-finals of the women's doubles with a 6-3, 7-5 victory over fourth seeds Elena Vesnina and Ekaterina Makarova.