World number one Novak Djokovic has said he is relishing a test of his men’s US Open title credentials against quarter-final opponent Andy Murray.

The 2011 competition winner reached his 22nd consecutive Grand Slam last-eight spot – and eighth straight in New York City – when beating Philipp Kohlschreiber 6-1 7-5 6-4 on Louis Armstrong Stadium at Flushing Meadows.

The Serbia superstar remains on course for his fifth consecutive final appearance in Queens but must first lock horns with British number one Murray, who came through a major test against in-form Jo-Wilfried Tsonga 7-5 7-5 6-4.

“We all know how good of a player he is and what kind of qualities he possesses,” said Djokovic of Murray.

Djokovic, 27, is targeting his second Grand Slam of the season having won Wimbledon this summer and has already beaten Murray this year in the Miami quarter-finals.

Their last meeting at the US Open saw Murray win his first Grand Slam title with a five-set victory and Djokovic knows he will be facing a motivated opponent.

Murray also beat Djokovic in straight sets to win a breakthrough Wimbledon title last year and the Belgrade native is bracing himself for a difficult match.

He added: “He’s been on and off this year, but I’m sure this is where he wants to do well. But I’m feeling very confident on the court as well. I think it’s going to be very, very high quality tennis. I’m looking forward to seeing where my game is against one of the world’s best players.”

Djokovic is the current 1.94 market leader in the US Open outright betting and five-time competition winner Roger Federer is next best in the market at 3.25.