Somerset ended an abysmal defence of the Twenty20 Cup with only their second group success and ended Glamorgan's quarter-final hopes with a 13-run win in the Midlands/Wales/West Division match at Taunton.
The hosts blasted 219 for five after losing the toss, with man-of-the-match Justin Langer top-scoring on 78, and Matt Wood (40) and Cameron White (36) making brisk contributions.
David Hemp then gave Glamorgan hope with 74 off 36 balls - but the asking rate was always high and they closed on 206 for six, with Andy Caddick claiming two wickets for 37 runs and Peter Trego 2-20.
Somerset's bowling has let them down throughout this season's competition and again it was exposed as Hemp, with three sixes and five fours, and Brendon McCullum - who hit 45 off 28 balls - put Glamorgan within sight of an unlikely victory.
But the experienced Keith Parsons conceded just five from the 16th over, removing James Franklin in the process, after Hemp had fallen to a good catch at long-on by James Hildreth off Trego.
That tilted the balance back Somerset's way and 26 were needed off the last over, bowled by Trego, who yorked Alex Wharf after his first ball had been dispatched for six.
Earlier, the tone of Somerset's innings was set by the first ball from Andrew Davies, which Langer cut through the offside for four.
Twelve came off the opening over, which was made to look tight as David Harrison went for 17 and then Davies 19 from his second over.
By the time captain Robert Croft brought himself on for the sixth over 71 runs were on the board. And Croft went for 19 to leave Somerset 90 without loss at the end of the fielding restrictions.
Langer reached his half-century off 21 balls, with a six and nine fours.
Wood's 40 came off 23 deliveries before he was stumped advancing down the pitch to Croft.
White surprisingly found it hard to time the ball following his record-breaking 141 not out against Worcestershire on Sunday.
But he and Langer are the competition's two leading run makers and they still added 75 before both fell in quick succession.
That left Somerset 172 for three in the 17th over.
Parsons (26) and Trego (15 not out) ensured there was no respite for the Glamorgan attack, of whom Wharf
T20, Twenty20 and Twenty20 Cup are registered trade marks of the England and Wales Cricket Board Limited (the “ECB”).
Products and services on this website are not offered in connection with, or with the endorsement of the ECB