Djokovic extends Grand Slam quarterfinals streak to 23

Novak Djokovic of Serbia reacts as he plays Gilles Muller of Luxembourg during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 26, 2015. (AP Photo/Rob Griffith)

MELBOURNE, Australia — Novak Djokovic reached his 23rd consecutive Grand Slam quarterfinal with a 6-4, 7-5, 7-5 win over Luxembourg’s Gilles Muller at the Australian Open on Monday.

Djokovic is trying to become the second man after Roy Emerson to win five Australian Open titles. He’s also aiming for his eighth major title overall.

The top-seeded Serb hasn’t lost a set yet in the tournament. He was rarely in trouble against Muller, saving all four break points he faced and hitting 47 winners to just 16 unforced errors.

He next faces eighth-seeded Canadian Milos Raonic, against whom he has a 4-0 head-to-head record.

The last time Djokovic failed to reach the quarterfinals of a Grand Slam was at the 2009 French Open.