Craig Kieswetter's unbeaten 89 drove Somerset to victory over Gloucestershire in their Friends Life t20 opener.
The visitors made the short trip to Taunton with a win and a defeat already and posted a daunting 190-6, only for Somerset to chase down the target with four wickets and just one ball in the bank.
Kieswetter did the bulk of the damage, taking the fight to the Gladiators after senior opening partner Marcus Trescothick had become the first of James Fuller's three victims off the first ball of the innings.
The England international struck four sixes in a 55-ball effort, receiving typically violent back-up from Jos Buttler (29 off 13).
Somerset needed just five off the final over, but even that looked like it might be beyond them as David Payne conceded just two runs off the first four balls and removed Craig Meschede for good measure.
Yasir Arafat was left with two balls to find the three needed for victory, and the first delivery he faced disappeared to the fence to get the hosts over the line.
Arafat had earlier taken 2-32 during a Gloucestershire innings dominated by a century stand for the thrid wicket between Hamish Marshall (49) and Ian Cockbain (63).