Yorkshire crashed from the high standards of four wins in five Norwich Union League games when Warwickshire wrapped up a seven-wicket victory with 18.1 overs to spare at Edgbaston.

The northerners' improved form began with the dismissal of Warwickshire for 59 at Headingley in July, but there was never any danger of a repeat performance. Charlie Dagnall had Gavin Hamilton caught behind from the first ball of the match as Yorkshire toppled from the heights of a record one-day score against Nottinghamshire at Scarborough on Sunday.

Darren Lehmann, the trail-blazer on that occasion with 191 out of 353 for six, went for 14 and Yorkshire only just managed to bat out their overs for a score of 137 for nine.

The main damage was done by Mo Sheikh. A loose shot by Lehmann to mid-wicket put the medium-pacer on the way to a career-best performance with four for 17. Anthony McGrath, caught at cover, was his next victim for a top score of 38 and the only other double-figure innings were played by Craig White (21) and David Byas (17).

Yorkshire, still not clear of relegation worries, needed something special in the field, but inspiration quickly ran out after Matthew Hoggard's second-ball dismissal of Mark Wagh.

Warwickshire reached 43 in the ninth over before Dougie Brown was caught at mid-on off Ryan Sidebottom, and Nick Knight carried on the charge with his first half-century of the season in the one-day league.

David Hemp benefited from two missed chances in a stand of 64 as Warwickshire cruised home with time to spare. Knight went for 53, caught at long leg off Lehmann, but Hemp saw the job through with an unbeaten 43.

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