Old campaigners Trescothick and Cork steal the show

Batting first, the Sabres posted a massive 303-5 thanks to a whirlwind 69 off 47 balls from Trescothick and a stand of 145 in 19 overs between Zander de Bruyn and James Hildreth – a Somerset record for the fourth wicket in one-day cricket against Surrey.

Matthew Spriegel contributed a valiant 53 from 59 balls but Surrey were dismissed for 209, with Murali Kartik taking 3-40.

A Jim Allenby half-century and 4-33 from Dean Cosker helped Glamorgan towards only their second victory of the CB40 season with a three-wicket success over Sussex at Swansea.

The defeat is a setback to Sussex's chances of reaching the competition semi-finals as they sank to their third defeat after they were restricted to 203-7 in their 40 overs.

Elsewhere, Mike O'Shea hit 90 to help the Unicorns pull off a shock three-wicket victory over stunned Worcestershire Royals in a thrilling match at Kidderminster to lift them into fourth place in the table.

Needing 278 to win, they reached their target with two balls to spare as O'Shea recorded his best one-day score which included five sixes and seven fours off 62 balls, to leave embarrassed Worcestershire still searching for their first win of the season after seven attempts.

In Group B, Ravi Bopara put his England snub behind him by hitting a superb half-century as the Essex Eagles cruised to a nine-wicket victory over the Northamptonshire Steelbacks at Wantage Road. Young opening batsman Rob Newton blasted his first half-century in senior cricket, making 66 off 78 balls, but some indifferent batting from his team-mates meant the rock-bottom Steelbacks could only reach 198-9.

Bopara, who was left out of England's Test squad in the morning, then smashed an unbeaten 88 from 89 balls with former Essex captain Mark Pettini plundering 58 off 61 balls as the Eagles triumphed with 40 deliveries to spare.

Warwickshire Bears strengthened their grip at the top of the Group C table with a 25-run victory over Leicestershire Foxes, despite a brilliant unbeaten century and career-best bowling figures from James Taylor.

Warwickshire opener Neil Carter laid the foundations for the Bears' win with the third limited-overs century of his career, scoring 101 out of their challenging total of 272-8.

Then Taylor launched a spectacular one-man bid for victory, hitting a blistering 103 off 95 balls, reaching three figures off the last delivery of the match.

But the Bears were able to plunder 56 runs off the last five overs, and, that proved the difference.

Alex Hales returned to haunt Durham by smashing an unbeaten 96 in Nottinghamshire's five-wicket triumph at Chester-le-Street.

Veteran seamer and Hampshire captain Dominic Cork held his nerve in a last-ball finish at Canterbury to clinch a tense two-run win over Kent.

Chasing Hampshire's 40-over total of 238-7 on a tricky St Lawrence pitch, Kent needed 13 off Cork's final over but Cork kept his cool to allow the Royals to bag their third win.