Trescothick smashed eight boundaries and two sixes from 32 balls
A brutal half century from Marcus Trescothick helped Somerset set up a Twenty20 final against Sussex after a comfortable seven-wicket win over Kent.
The opener smashed 56 from just 32 deliveries while James Hildreth's assured 36 saw the 2005 champions overhaul Kent's total of 145-5.
Darren Stevens's 77 was the highlight of Kent's innings, and he was joined in a stand of 61 by captain Rob Key (34).
Seamer Alfonso Thomas (2-26) was Somerset's outstanding bowler.
Presented with a placid pitch which had restricted the Northants batsmen in the first semi-final of the day, Somerset captain Justin Langer won the toss and elected to field.
His decision immediately paid dividends when Thomas uprooted Joe Denly's middle stump before trapping the dangerous Martin van Jaarsveld lbw for 10.
Charl Willboughy soon bowled Geraint Jones as Kent stuttered to 32-3 after the six-over powerplay but a spirited fourth-wicket partnership between Key and Stevens steadied the innings as Somerset pushed for further openings.
Key was eventually bowled by Peter Trego, albeit in bizarre circumstances when the ball clipped off stump before ricocheting off wicketkeeper Craig Kieswetter's pads on to the stumps.
Umpires Ian Gould and Rob Bailey consulted television official Richard Illingworth, who confirmed the ball had dislodged the bail before cannoning off the wicketkeeper's pads, much to Key's annoyance.
However, two generous overs from spinners Max Waller and Arul Suppiah - whose final six deliveries cost 20 runs - pushed Kent to 145-5, with Stevens run out off the final ball of the innings for a career-best score from 51 deliveries, including seven boundaries and two sixes.
Somerset's innings began in spectacular style as Trescothick smashed four successive boundaries from Amjad Khan's first over.
The run-fest continued in the following over as Wayne Parnell was smeared over mid-on by the former England opener, while Simon Cook - on for the profligate Khan - was dispatched into the stands over midwicket for six.
Although Kent's bowlers were guilty of bowling too full, Trescothick combined power and subtlety, driving through the covers before gliding Cook past third man for consecutive boundaries.
The opener - who confirmed he will not be available for selection for England's Ashes decider at The Oval next week - brought up his half century with his second six over cover off Azhar Mahmood, reaching 53 in just 26 deliveries.
With his options rapidly diminishing, Key turned to spinner James Tredwell, who made the vital breakthrough when he had Langer caught off a leading edge for 17 and his second over saw Trescothick dismissed in similar fashion, presenting Kent with an opportunity to restrict the runs with two new batsmen at the crease.
But intelligent batting from Hildreth and Zander de Bruyn, who put on 57 in a third-wicket partnership, ensured the Sabres reached their target without any further concerns.
Hildreth was bowled with five runs to go, attempting to score the winnings runs with a huge smear off Mahmood, but De Bruyn remained unbeaten on 33.
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