Melbourne: Novak Djokovic held off a valiant Swiss man for a five-hour, five-set victory Sunday night, extending his winning streak to 18 matches at the Australian Open and then ripping off his shirt to celebrate. The big surprise: it was a fourth-round match against Stanislas Wawrinka of Switzerland, not a final against Roger Federer.
Djokovic edged 15th-seeded Wawrinka 1-6, 7-5, 6-4, 6-7 (5), 12-10 in a momentum-swinging encounter, cashing in on his third match point to reach the quarterfinals for a 15th consecutive major.
The style was reminiscent of his 5-hour, 53-minute, five-set final win here last year against Rafael Nadal, only it was 51 minutes shorter.
Djokovic held off 15th-seeded Wawrinka 1-6, 7-5, 6-4, 6-7 (5), 12-10 in a five-hour match.
"He deserved equally to be a winner of this match," said Djokovic, who is aiming to be the first man in the Open era to win three consecutive Australian titles. "I give him a lot of credit. He has all my respect. He was the aggressive player on the court. I was just hanging in there trying to fight."
Djokovic had beaten Wawrinka - the perennial No. 2 among Swiss tennis players to 17-time major winner Federer - in their 10 previous matches. He hadn't lost a head-to-head since 2006.
Djokovic said the win "brings back the memories from 12 months ago with Rafa."
"We are midway through the tournament but it feels like a final to me."
Djokovic next lines up against Tomas Berdych, the 2010 Wimbledon finalist who advanced to the quarterfinals for a third consecutive season with a 6-3, 6-2, 7-6 (13) win over South Africa's Kevin Anderso.
Fourth-seeded David Ferrer had a 6-2, 6-1, 6-4 win over No. 16 Kei Nishikori of Japan to set up an all-Spanish quarterfinal against Nicolas Almagro, who was leading 6-2, 5-1 when No. 8 Janko Tipsaveric retired from their fourth-round match.
Maria Sharapova barely had any trouble on the women's side, beating Kirsten Flipkens of Belgium 6-1, 6-0 earlier Sunday to continue a dominant an unparalleled run in Melbourne.
The No. 2-ranked Sharapova has lost only five games in four matches on the way to the quarterfinals, an Australian Open record that seems to be immaterial to the 25-year-old Russian.
"Well I'm certainly happy to be playing this well but ... it only gets tougher from here," said Sharapova, who is playing her first tournament of 2013 after withdrawing from a warmup event at Brisbane because of an injured right collarbone.
Steffi Graf conceded only eight games in her opening four matches here in 1989, when she won the second of her three straight Australian Open titles. Monica Seles matched that mark.
Sharapova has been even more dominant. She started with a pair of 6-0, 6-0 wins - the first time that has happened at a major since 1985 - and then beat seven-time Grand Slam winner Venus Williams 6-1, 6-3 in the third round.
She next plays fellow Russian Ekaterina Makarova, who ousted fifth-seeded Angelique Kerber 7-5, 6-4. Sharapova beat Makarova in the quarterfinals here last year before losing the final to Victoria Azarenka.
Li Na, who reached the final here in 2011 and won the French Open later that year, saved a set point in the tiebreaker before beating Julia Goerges 7-6 (6), 6-1. She'll next play No. 4 Agnieszka Radwanska, who beat No. 13 Ana Ivanovic 6-2, 6-4 for her 13th consecutive win. Radwanska won the Auckland and Sydney titles before coming to Melbourne.
The late-finishing men's match almost changed the complexion of the tournament.
Critics who questioned if anybody could challenge Djokovic, Federer and U.S. Open champion Andy Murray in the absence of Nadal at this tournament got an answer quickly.
Wawrinka stunned the top-ranked Djokovic with three service breaks in the first set, and led 5-2 in the second before the 25-year-old Serb rallied by winning six consecutive games. But just as Djokovic seemed to be taking control of the match, Wawrinka launched his own comeback to win a long tiebreaker and force a fifth set.
Djokovic got to serve first in the fifth set, giving him a psychological edge as long as he held his serve. In the end, Warwinka didn't quite have the big-time experience.
Wawrinka had game point in the 22nd game of the fifth set, but let Djokovic get on a roll. The Swiss saved his first match point with a service winner after 4 hours, 55 minutes and saved another two minutes later.
At 1:40 a.m. local time, Wawrinka was whacking his head with the racket and biting the ball after giving Djokovic another match point. Moments later, he was slumped on the court after netting a backhand.
Djokovic raised both arms, walked to the net and embraced his beaten rival, then pulled of his shirt and flexed - shades of the 2012 final.