Murray is seeking his first win over Davydenko

Murray had to dig deep to see off the Chilean 10th seed and said: "Before I went on I saw Agassi play his last match, and it inspired me.

"I didn't realise how much he meant to tennis and to me growing up until I saw him play his last point."

The 19-year-old Scot, who faces seventh seed Nikolay Davydenko on Tuesday, said: "It will be a pretty tough task."

Murray, chasing his first Grand Slam quarter-final berth, lost his only previous meeting with the Russian in March, also on a hardcourt.

"He is one of the most consistent players and has done really well in the Grand Slams," he said.

I think 50 or 60% of the people in there were probably in tears as well or holding it back Andy Murray on Agassi's locker room ovation

"I'm playing better than when I lost to him but I'll have to play well to win."

Murray had only dropped a set in sweeping past Robert Kendrick and Alessio Di Mauro in the first two rounds at Flushing Meadows.

But he was forced to come from two sets to one down to beat Chile's Gonzalez 6-3 3-6 2-6 6-3 6-2.

Murray revealed he was still feeling emotional after Agassi's standing ovation in the players' locker room as he began his match.

The US tennis great retired after his 5-7 7-6 (7-4) 4-6 5-7 defeat to German qualifier Benjamin Becker.

"I'm not going to lie," said Murray. "But I think 50 or 60% of the people in there were probably in tears as well or holding it back.

"I know I was. It was really, really emotional. I was genuinely really upset but I fought really hard (against Gonzalez)."