By Caroline Cheese BBC Sport at Wimbledon

Match report The match as it happened Day six photos

Andy Murray says he will leave Wimbledon in the knowledge that he can compete with the world's best.

"The support when I walked off Centre Court made me feel like I belonged there," said an exhausted Murray after a five-set defeat by David Nalbandian.

"I want to play in big tournaments and I have proved to myself that I can.

"But it's not about doing it for one week of the year, it's about doing it for 30 weeks. I'm not there physically yet but my tennis is."

Brave Murray falls to Nalbandian

After establishing a two-set lead, Murray began to look tired in the third set and that allowed Nalbandian back in.

The 18-year-old, who was treated on court for cramp before the fifth set, said: "I couldn't move towards the end.

"I was annoyed I couldn't keep going in the fifth set. I felt I was running around OK in the fourth, but in the fifth, I really started to feel tired.

I think my life will change quite a lot - but maybe it deserves to because I did very well Andy Murray

"When I got back in the locker room, my legs were so tired I couldn't get up. I just got tired because I've never played a five-set match before.

"I wasn't expecting to do so well so I have to look at it positively. In a few days I'm sure I'll realise what I've done and I'll be proud of myself."

Murray was roared on by a capacity crowd, including fellow Scot Sir Sean Connery, on his Centre Court debut.

He said: "I've just heard that Sean Connery was going nuts in the Royal Box when there was an overrule.

"To play on Centre has always been a dream and the noise was unbelievable."

Murray is entered in the mixed doubles at Wimbledon with Israel's Shahar Peer and afterwards plans to play in the ATP grass-court tournament in Newport.

The teenager said he was ready for the extra attention that would come his way.

"I think my life will change quite a lot," he said. "But maybe it deserves to because I did very well.

"Not every 18-year-old gets to the third round in their first Grand Slam and takes an ex-finalist to five sets.

On dealing with the expectations on his shoulders, he added: "I just have to try and do it.