Durham 331 for 3 (Stoneman 112, Mustard 98, Borthwick 66*) beat Somerset 327 for 8 (Cooper 104, Trego 53, Hastings 5-41) by seven wickets

Scorecard

Mark Stoneman hits over the top on the way to his hundred Getty Images

A record-breaking stand of 211 between openers Mark Stoneman and Phil Mustard helped Durham maintain their winning start in the Royal London Cup.

Having been set a target of 328, the visitors won with seven wickets and 21 balls in hand, courtesy of Stoneman's 100-ball century and 98 from wicketkeeper Mustard. It was not only a second successive defeat in Group A for Somerset, but an eighth defeat in their last 10 completed games, in all competitions.

Director of cricket Matthew Maynard, whose side has won only twice on home soil in all forms of the game this season, put his faith in youngsters Tom Abell and Adam Hose at the top of the order after captain Jim Allenby had chosen to bat first.

The pair added 69 for the first wicket, inside 13 overs, before both batsmen departed within the space of three balls. The impressive Hose was caught by Mustard off the bowling of Usman Arshad for 41 before Abell fell to a Scott Borthwick catch, for 23.

Peter Trego, for whom runs have been hard to come by, and Tom Cooper, added 90 for the third wicket in 17 overs before Trego, who reached his 50 off 52 balls, with seven fours and a six, holed out to Ryan Pringle off John Hastings at 159 for 3.

Although James Hildreth was brillianty caught in the slips by Borthwick, Cooper continued to dominate the visiting attack for whom Hastings was the pick. Cooper hit 12 fours in passing three figures for the first time since arriving in the west country. He faced just 95 balls.

With Craig Overton weighing in with 49 from just 25 deliveries, Somerset posted 327 for 8 in their 50 overs. Hastings took 5 for 41 off his 10 overs whilst Arshad, who was struck for four sixes by Overton in the space of two overs, finished with 3 for 80.

Durham wasted little time in establishing themselves with the bat. Stoneman, who struck seven fours and two sixes in reaching 50 off 30 balls, led the way alongside Mustard. The pair passed 50 off the penultimate ball of the seventh over and brought up their 100-run partnership in the 14th.

In the end, Mustard chanced his arm once too often and was caught at short third man by Hildreth, off Craig Overton, for 98. It was the highest stand by a Durham pair against county opposition in one-day cricket. By the time Stoneman posted his century, from 100 balls, Durham were within sight of victory. Borthwick continued where Mustard left off and Somerset, despite the efforts of the Overton twins, and spinner Jack Leach, had no answer.

Stoneman eventually perished, caught by Hose off Jack Leach for 112, and Graham Clark miscued a pull to Jamie Overton off Lewis Gregory for 12. Still, Borthwick took just 36 balls to register his half-century and, with Paul Collingwood at his side, duly guided Durham to victory in the 47th over.