Grigor Dimitrov has admitted that he is expecting a much tougher match against Andy Murray in the Australian Open compared to their last clash at Wimbledon.

The 23-year-old powered past a below-par Murray on Centre Court in the quarter-finals of the competition to clinch his first Grand Slam semi-final berth.

However, Dimitrov is adamant that victory will count for nothing when he faces the Scot in the fourth round of the Australian Open on Sunday.

"That day it was not him out there. I think we all know that," Dimitrov told reporters.

"You hardly ever see top players feel really flat early on in a match. It's a different scenario this time."

Dimitrov beat Marcos Baghdatis in the third round to set up the match against the British number one.