MELBOURNE — Novak Djokovic survived an almighty scare from an inspired Stan Wawrinka in a five-hour, five-set thriller at the Australian Open Sunday, reaching a 15th consecutive Grand Slam quarterfinal but only after digging himself out of a huge hole. For the first 50 minutes of the contest, Wawrinka played as if possessed by his compatriot Roger Federer and confounded the world No. 1 with brilliant backhands and ferocious forehands to notch up five straight breaks of serve. Even when Djokovic had weathered the worst of the storm and clawed his way back from 6-1, 4-1 down to win the second and third sets, the world No. 17 made the Serbian earn every point and forced a decider after a dramatic tiebreak. The Swiss blew four precious break points in the ninth game of the fifth set and Djokovic converted his third match point with a brilliant backhand winner to seal a 1-6, 7-5, 6-4, 6-7, 12-10 win. In a conscious echo of his win over Rafa Nadal in last year's nearly six-hour final on Rod Laver Arena, Djokovic ripped off his shirt and roared in delight at a victory which kept alive his hopes of a third successive title at Melbourne Park. “We are only halfway through the tournament but it felt like a final to me,” said Djokovic, who will meet fifth seed Tomas Berdych in the next round. “He deserved equally to be a winner of this match. Tonight he showed his qualities. He was the aggressor on the court and I was just hanging in there trying to fight. I always believed I could win the match and I am absolutely thrilled to be in the next round. It certainly brings back memories of last year with Rafa.” Wawrinka, who left the court with tears in his eyes, was distraught after coming up short despite playing the match of his life. “I think it's the best match I've ever played,” he said. In the women's draw it was business as usual as Maria Sharapova progressed with brutal efficiency to reach the last eight having lost just five games all week — an Australian Open record. Agnieszka Radwanska continued her perfect start to the year with her 13th successive victory to set up a quarterfinal with Li Na, while David Ferrer eased further into the gap in the draw left by his injured compatriot Nadal. Angelique Kerber crashed out, however, and she was joined at the exit by Janko Tipsarevic, who retired from his tie with a foot problem after spending more than 11 hours on court in his four matches. Sharapova was held up briefly when her serve deserted her in the first set but she still hammered Belgian Kirsten Flipkens 6-0, 6-1 to set up a repeat of last year's last eight clash with compatriot Ekaterina Makarova, who upset Kerber 7-5, 6-4. Ferrer has reached the quarterfinals for the third straight year by ending the challenge of error-prone Japanese Kei Nishikori 6-2, 6-1, 6-4. He will face Nicolas Almagro. Fifth seed Berdych had said playing big-serving South African Kevin Anderson would be like facing himself but the contest only really came to life in an epic third-set tiebreak, which the Czech won 15-13 to claim a 6-3, 6-2, 7-6 win. Radwanska made four unforced errors to 34 for Ana Ivanovic in their fourth round tie and sealed a 6-2, 6-4 rout of the former world No. 1 with her seventh ace. Li converted all five of the break points she earned in her 7-6, 6-1 win over Julia Goerges to reach the last eight of a grand slam for the first time since she won the French Open. Almagro was the beneficiary of Tipsarevic's retirement. “That's not the way you want to win,” said the 10th seed, who was leading 6-2 5-1 when the Serbian decided he could not continue. — Reuters