Cilic appeared to be hampered by an injury to his ankle in Arthur Ashe Stadium
World No 1s in action
The French Open champion's backhand around the net was just one of 59 winners on his route to glory
Reaching the top of the rankings is beyond 'my level' says the humble Swiss
After beating Andy Murray the former world number one will meet Rafael Nadal in the semi-final
But defending women's champion Victoria Azarenka is out
Andy Murray could also rank the achievement among his greatest triumphs due to the difficult draw
The Czech star rattled through the first two sets before overcoming a brief blip in the third to beat the Spaniard 6-1 6-4 2-6 6-4 and book his place in the semi-finals
Play was suspended for four hours due to the extreme conditions
Serbian needed just three sets to seal the win 6-0 6-4 6-4
The Australian youngster was a set down at the time
Defending champion looked rusty by his high standards
Andy Murray wrapped up his public preparations for next week’s Australian Open by losing an exhibition match to Lleyton Hewitt here in Melbourne yesterday, but is in a good frame of mind.
Andy Murray started the craze, but is there an advantage to enlisting a Grand Slam winner from over 20 years ago as coach
The tournament in Melbourne begins on Monday - but who will be the last man standing?
Laura Robson will face Belgium's Kirsten Flipkens in the women's draw