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Manchester United moved to within one win of the Premier League title with a comfortable dismissal of West Ham.

Cristiano Ronaldo scored from 12 yards after three minutes and bundled home his 40th goal of the season from close range in the 24th minute.

Carlos Tevez added a third from 25 yards two minutes later before Nani was sent off for head-butting Lucas Neill.

Dean Ashton pulled one back with an overhead kick, but Michael Carrick drove in a fourth after 58 minutes.

The victory means United will retain the title with victory at Wigan next Sunday, thanks to their vastly-superior goal difference compared to rivals Chelsea.

United were helped by a desperately listless West Ham side that never gave the slightest hint they would repeat last season's win at Old Trafford that preserved their Premier League status.

And any fears boss Sir Alex Ferguson may have had about a hangover following their Champions League semi-final victory against Barcelona on Tuesday were dispelled by a vibrant performance.

If United were craving a fast start and an early goal, they could not have wished for more generous defending on the part of West Ham that gave them the lead after three minutes.

Ronaldo escaped the attentions of Neill, and the rest of the Hammers' defence stood off as he raced into the area and beat Robert Green with a deflected shot.

West Ham were almost allowed a route back into the game three minutes later when United keeper Edwin van der Sar was uncertain and Patrice Evra had to clear off the line from Bobby Zamora.

And the visitors had appeals for a penalty waved away when Wes Brown handled under pressure from Zamora, but referee Mike Riley gave a foul against the West Ham striker.

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United doubled their lead after 24 minutes when West Ham failed to deal with Owen Hargreaves' long cross and Ronaldo bundled in at the far post for his 40th goal of the season.

Tevez made it three against his former club two minutes later when he sent a vicious swerving drive high past Green from 25 yards.

West Ham looked dejected and beaten, but Ashton gave them a measure of hope with a spectacular overhead kick after 28 minutes.

And the lifeline was extended further 10 minutes before the interval when Nani inexplicably head-butted Neill after a minor fraces - an offence made worse by the Manchester United winger hitting the ground holding his head in a desperate attempt to avoid punishment.

Ashton injured a muscle in scoring his spectacular goal and it was no surprise when he went off early in the second half, to be replaced by Carlton Cole.

West Ham were in no mood to take advantage, however, and desperate defending allowed Carrick to stride forward unopposed to send in a deflected shot from 25 yards for United's fourth after 58 minutes.

It was now damage limitation for Alan Curbishley's side and an opportunity for United to improve their goal difference even further.

And United substitute Darren Fletcher almost added a fifth with 20 minutes left, only to see his angled drive come back off an upright.

The rest of the game was played out in a carnival atmosphere as Old Trafford anticipated another title triumph.

BBC Sport Player Rater man of the match: Manchester United's Cristiano Ronaldo 8.77 (on 90 minutes).