AMIR Khan is making his opponents look like dummies, but his father insists each one is better than the last.

The Bolton teenager crushed Belorussian Vitali Martynov in just 75 seconds for his fifth professional win in Nottingham on Saturday, renewing calls for him to face tougher opposition.

But Shajaad Khan says every fighter his son takes on has a higher ranking.

He said: "Each opponent is better than the previous one, but the way he is beating them makes it appear that is not the case.

"He is getting better all the time. He is working hard in the gym and with every fight that comes along he is better prepared, stronger and fitter.

"But everyone has to be patient. Amir has to go up the ladder slowly and the media, in particular, are putting on pressure for him to fight better opponents."

Khan, although billed as a lightweight, is ranked as a light-welterweight on BoxRec, the world's leading boxing stats website. After his latest win he has risen to 19th in Britain and 175th in the world.

His father added: "It is not easy for his manager Frank Warren to find the right opponent, but remember they have to be approved by the British Boxing Board of Control.

"We accept that it will take 12-18 months before he will fight for a title and has to be 21-years-old before he can challenge for a British title.

"But he is learning with every fight, however long it lasts."

Khan is taking a week off from training before starting his build up to his next fight against, an as yet unnamed opponent, at London's ExCel Centre on February 25.

He said: "I still think I am only boxing to 60 per cent of what I can do but I have still got a long time. I do not think I will peak for another two years."

Khan insisted even one-sided fights like Martynov provide a valuable learning experience in his bid to reach the top.

And despite pushing his opponent across the ring and dumping him on the canvas from a lightning combination he insisted he had not gone in search of a knockout.

Khan added: "I don't think I threw one hard punch in there, I was just boxing and picking my shots and using my speed."

Martynov had come to the ring boasting a solid record of 10 wins from his 11 professional fights but was dominated by Khan, who will take another step up in class next month.

And his trainer Oliver Harrison believes his charge is ready for big things after watching the way he has dealt with his five opponents to date.

Harrison said: "Amir is as good as it gets right now and I would happily put him in against any opponent now and believe he would win.

"I have worked with boxers for a long time and I have never seen anything like it. He listens to everything I say and then he just goes out and does it.

"I can't ask for any more from him. I spend one hour a day working with him and when you are doing that you just can't go wrong."

Tickets for Khan's next fight in London are available from Premier Consultancy on 01204 535332 priced from £40.