Melbourne, Australia (SportsNetwork.com) - Defending champion Stan Wawrinka withstood a tough match against Guillermo Garcia-Lopez on Monday and advanced to the quarterfinals of the Australian Open.

The fourth-seeded Wawrinka pulled out a 7-6 (7-2), 6-4, 4-6, 7-6 (10-8) victory and will next face the winner of the Kei Nishikori-David Ferrer match.

Garcia-Lopez, who ousted Wawrinka in the first round at last year's French Open, won the first five points of the fourth-set tiebreak and had five chances to force a fifth set.

Wawrinka, though, saved them all and survived to keep his hopes of defending his title alive.

Top-seeded and four-time Aussie champion Novak Djokovic will try to reach his 23rd consecutive Grand Slam quarterfinal when he takes on Gilles Muller late Monday night.

Eighth-seeded Milos Raonic and No. 12 Feliciano Lopez will play in Monday's other fourth-round match.