Norwich's Darren Webster vowed to 'get his mind right' after he crashed out of the PDC World Darts Championship.

Webster – nicknamed the Demolition Man – was beaten 5-0 in the quarter-finals by qualifier Jamie Lewis in front of a packed house at Alexandra Palace.

Welshman Lewis, conqueror of second seed Peter Wright on Wednesday, was quickly out of the blocks, and never looked back as Webster, the 23rd seed, failed to keep up in the battle between two of the tournament's rank outsiders.

At 4-0 down and Lewis needing only one more set to go through, Webster – wearing yellow and green colours – threatened a comeback, but at two legs each he missed double top and Lewis stepped up needing double six, which he got at the second attempt.

Webster looked a shadow of the player who disposed of 10th seed Simon Whitlock in the second round and revealed afterwards that his concentration had been a problem.

'When you go to tournaments like this everything on the day has to be right – a couple of hiccups today and it cost me,' he said. 'That is all I will say – my mind wasn't on the game 10 minutes before I went on.

'I am a bit disappointed because I am practising absolutely superbly and I thought I was going to go on and on and on.

'I will do anything – anything and everything to get my mind from wandering. They sort my head out and these are all in trouble, I don't care what they say. I should have given him a better game than I did. We have to learn now to sort my mind out. Once they get that right they are in trouble.'

While Webster admitted he was 'a bit distraught' he took nothing away from his Welsh opponent, who threw 14 maximums for a 101.26 average to book a place in today's semi-finals.

'At the end of the day the boy played superb,' Webster added. 'You can't take it away from Jamie. I kept saying, 'come on, smash him, smash him and dig in', but at the end there I just said, 'well done, Jamie, you played superbly'. You can't argue with that. I gave it best shot. I have had a great year: three last-16s, two quarters and a semi-final in majors, hit a nine-darter... a good year really.'