Craig Kieswetter was the match winner for Somerset again with another century this time helping them to a Clydesdale Bank 40 Group B with an eight-wicket victory over Durham at Taunton.
After a match-winning 152 in the County Championship success over Warwickshire on Saturday, Kieswetter smacked 103 as Somerset moved off the bottom of the group.
The England wicketkeeper plundered nine fours and six sixes in his 61-ball innings as Somerset overcame Durham's 147 with almost half their 40 overs to spare.
Gareth Breese top-scored for Durham with 31 not out, while Peter Trego removed three of the top four to finish as Somerset's most successful bowler with 3-26 in six overs.
More good news for Somerset was the return to action of former England batsman Marcus Trescothick, three months after he ruptured ankle ligaments while fielding against Nottinghamshire at Trent Bridge.
Trescothick made 15 from 17 deliveries before being bowled by Chris Rushworth and, having proved his fitness, now looks set to lead Somerset in Tuesday's Friends Life t20 quarter-final against Essex at Taunton.
Durham, with three wins from their previous six CB40 games, were always struggling once Trego had ripped through the top order.