Sussex Sharks came through a nervy run chase to win a low-scoring Friends Life t20 encounter with Somerset by four wickets at Hove.
Off-spinner Ollie Rayner recorded the third best Twenty20 bowling figures in Sussex's history, claiming 5-18 as Somerset's much-vaunted batting line-up imploded to 90 all out in 17.2 overs.
The Sharks were without skipper Michael Yardy, who is taking a break from the game to continue his recovery from the depression which forced him home early from England's World Cup campaign in April.
Yardy's deputy Murray Goodwin opted to field and Somerset skipper Marcus Trescothick gave the visitors' innings early momentum with 33 off 23 balls, including three sixes - the first of which came off Rayner in the opening over.
But Craig Kieswetter's departure for three in the fourth over, skying a heave at seamer Chris Liddle's bowling, was the start of a spectacular meltdown.
Rayner was the chief destroyer, his haul included the big wicket of Trescothick, brilliantly caught on the boundary by Luke Wright, who juggled the catch to ensure he could regain his balance and avoid stepping over the rope.
The spinner, who was recently recalled from a loan spell at Middlesex, completed his five-for by having Jos Buttler (4) caught-and-bowled with the final delivery of his four-over allocation.
Faced with such a modest target under floodlights, Sussex were reduced to 22-3 by new-ball pair Gemaal Hussain (2-18) and Steve Kirby (2-17).
Goodwin steadied the ship with 27 and, despite two wickets for left-arm spinner Roelof van der Merwe (2-15), the hosts got home from the third delivery of the 17th over, Rayner (4no) hitting the winning boundary to cap a man-of-the-match display.
Sussex have won four of their five matches in the competition to sit second in the South Group, while Somerset remain third after suffering their second defeat.