By Simon Cambers

NEW YORK (Reuters) - Teenager Andy Murray felt there was no need to hang his head in shame following his fourth-round defeat by Russian seventh seed Nikolay Davydenko at the U.S. Open on Wednesday.

Trailing two sets to one when the match resumed on Wednesday after rain halted play on Tuesday, Murray produced three double faults in the first game and Davydenko cruised to a 6-1 5-7 6-3 6-0 victory.

But though he failed to produce his best against a rock-solid Davydenko on Wednesday, Murray said he was delighted to have reached the last 16 at a grand slam for the second time this season.

"(I am) absolutely not disappointed at all," Murray said.

"I had a great summer. I couldn't have asked for any more. My ranking is inside the top 20. I've equalled my best result in a grand slam in my favourite tournament.

"A lot of the young players can play well for a few weeks and then they'll have a few bad weeks, but I've kept it up. Since Wimbledon, I've won at least three matches in every tournament, which is a really good record."

Murray found Davydenko too good in all departments and said there was little he could have done to change things.

"I never played against someone who's played a set as well as that," he said.

"I didn't help myself by serving three doubles in the first game. (But) if someone plays like that, sometimes you just have to say, 'too good'.

The 19-year-old Scot said he was now looking forward to pushing his ranking even closer to the top 10.

"I'm so excited now because I think my serve can get much better, my movement can get better, I can get fitter, I can improve my volleys, my slice. Mentally, I can get stronger," said Murray, who is being coached by Brad Gilbert.

"Probably after this tournament, I'm going to be ranked 17 in the world. I don't have too many points to defend until Wimbledon next year. So I'm going to go for it.

"I'm not saying I'm going to do it, but there's an outside chance of getting into (the season-ending Masters Cup in) Shanghai. I'd love to play in that."