Archie Vaughan ends Yorkshire's winning start with career-best 95

Four-wicket seamer Jake Ball and opener Archie Vaughan with a career best 95 starred as Somerset ended Yorkshire's 100 percent winning start to this season's Metro Bank One-Day Cup by bowling the Group B leaders out for 247 at York and then chasing confidently.

Somerset joined their hosts on 12 points at the top of the table at the halfway stage in the group campaign courtesy of this six-wicket win with five balls remaining. Both counties having won three and lost one.

Yorkshire still hold sway courtesy of a superior net run-rate, but they were second-best on a used Clifton Park pitch.

Yorkshire lost wickets in clusters at either end of a scrambling innings which saw ex-England limited overs quick Ball take an excellent 4 for 34 from 9.4 overs and Matthew Revis top-scored with a middle-order List A best of 85 off as many balls.

Ball's best List A figures in just over six years preceded Sheffield-born teenager Vaughan's classy 127-ball effort with 11 fours. It was ironic that this senior best should come against the county for whom his father Michael starred.

Yorkshire, inserted, slumped to 28 for 3 inside 10 overs.

Without injured in-form opener Imam-Ul-Haq (hip), they lost Adam Lyth bowled by a beauty from Ball, Will Luxton run out next ball and James Wharton caught behind one-handed going low to his right by James Rew off Ben Green.

Luxton misjudged a push to mid-off, where Josh Thomas misfielded before recovering to throw the non-striker's stumps down.

Revis, who hit nine fours, held things together on the pitch used for Tuesday's win over Lancashire, with Yorkshire compiling nothing more than a workable total.

Fin Bean, on 28, cut 18-year-old debutant seamer James Theedom to backward point with the score on 72 in the 18th over.

Revis oozed confidence following three recent Championship centuries and a 69 earlier in this competition. He reached a 49-ball fifty here shortly before Yorkshire reached the halfway-mark in their innings at 115 for 4.

He found an ally in fellow all-rounder George Hill. They calmly shared a recovery fifth-wicket partnership of 102.

Yorkshire then lost four quick wickets, including Revis and Hill caught pulling, as the score fell from 174 for 5 in the 36th over to 204 for 8 in the 42nd. Green's second wicket accounted for Revis, 34-year-old Ball's second was Hill for 41.

Tom Lammonby's left-arm seam also claimed two wickets in that period.

Dan Moriarty heaved the only two sixes of Yorkshire's innings in a career-best 30 before holing out to cover as Ball struck twice in the 49th over to wrap things up.

Vaughan, in his first competitive senior career appearance against his birth county, steered Somerset's stress-free chase.

Lammonby was well caught at deep gully by Lyth off Hill en route to 48 for 1 after 10 overs before 19-year-old Vaughan shared a second-wicket partnership of 70 with Lewis Goldsworthy, 30.

Vaughan was particularly strong off the back foot on either side of the wicket. He reached his fifty off 65 balls.

Goldsworthy fell at 111 for 2 in the 25th over when he top-edged a pull at Revis to long-leg.

Vaughan continued on unflustered, sharing 64 with his captain James Rew. But he was bowled looking to go over the top against Dom Bess's off-spin. Still, at 175 for three in the 38th, Somerset were in a strong position.

James Rew finished unbeaten 53 off 62, while brother Thomas also contributed 31.