Former World No 3 Grigor Dimitrov displayed a dominating performance as he breezed past US Open champion Dominic Thiem in straight sets in the Australian Open men’s singles fourth round tie on Sunday.

The Austrian third seed, last year’s losing finalist, appeared to lack energy after rallying to beat Nick Kyrgios over five gruelling sets on Friday in front of a raucous crowd.

He struggled to match the intensity of the 18th-seeded Bulgarian and slumped out 6-4, 6-4, 6-0 in 2hr 1min.

Dimitrov will now play giant-killing Russian qualifier Aslan Karatsev in the quarter-finals after he stunned 20th seed Felix Auger-Aliassime over five sets.

“I feel great. Throughout every season you have one of those matches where you just keep the ball rolling and today was just one of these days,” Dimitrov said.

“I was entirely just trying to focus on what I was doing … I had to very composed against him. Dominic is an extraordinary player.”

Dimitrov, who has yet to drop a set, has now reached the quarter-finals or better in Melbourne four times, with his best showing in 2017 when he lost an epic five-set semi-final to Rafael Nadal.