Glamorgan 126 for 1 (Allenby 47*) beat Somerset 125 for 6 (Trego 42*, Wagg 3-29) by nine wickets
Jim Allenby produced a fine all-round performance to help unbeaten Glamorgan to their fourth Friends Life t20 win thrashing Somerset by nine wickets at Cardiff.
In front of a crowd of nearly 9,000 Glamorgan, who remain top of the Midlands, Wales and West Group, restricted Somerset to 125 for 6 with a fine bowling and fielding performance.
And Allenby (47 not out from 47 balls), who also had bowled four tight overs, and Chris Cooke (42 not out from 28 balls) helped to knock off the 126 needed with 4.4 overs to spare. For Somerset, who had won their opening two encounters, Peter Trego top-scored with 42 while Craig Meschede made a quick-fire 30 with the only two sixes of the innings.
Somerset decided to bat after winning the toss but made a dreadful start. Graham Wagg reduced Somerset to 14 for 2 in the fourth over taking the wickets of Marcus Trescothick and Craig Kieswetter with consecutive balls.
Trescothick was caught on the mid-wicket boundary while Kieswetter was bowled. And it got even better for home side when Michael Hogan bowled former Glamorgan captain Alviro Peterson as Somerset lost three wickets in seven balls.
Trego and James Hildreth tried to repair the innings and Somerset had reached 54 for 3 at the halfway stage of the innings. But they suffered another collapse. Hildreth was bowled attempting to sweep Nathan McCullum, while England's Jos Buttler played on to Dean Cosker to leave them 78 for 5 in the 15th.
Meschede put some late impetus into the innings with two massive sixes but Hogan's final two overs conceded a total of only 12 runs.
Glamorgan made a positive start to their reply reaching 38 for nought off the first five overs with Mark Wallace taking 14 from an over from Alfonso Thomas and then striking a six and a four in the next over off Yasir Arafat as the Welsh county brought up the 50.
But Arafat got his revenge bowling Wallace for 30 from 19 balls. Glamorgan continued in a positive vein reaching the halfway total of their chase in the eighth over and then 77 for one after 10 overs Cooke hit Trego for two sixes in one over as Glamorgan breezed to victory with 28 balls in the bank.