Essex produced an outstanding bowling performance to bowl out Hampshire for 105 and take one of the last spots in the Twenty20 Cup quarter-finals.
Batting first at Chelmsford, Essex were bowled out for 159 after failing to capitalise on Mark Pettini's 49.
But as soon as Graham Napier sent down a wicket maiden for the second over, the visitors felt the pressure.
Jamaica-born youngster Maurice Chambers gave up just 18 runs in his four overs before Danish Kaneria got to work.
Hampshire had been strengthened by the arrival of both Chris Tremlett and Dimitri Mascarenhas, who had netted with the England squad at Lord's in the morning.
They earned their corn, taking seven wickets between them, and Essex seemed to have an under-par score at the midway stage.
That was despite Pettini's 34-ball 49, in which he dominated a stand of 60 for the opening wicket with Jason Gallian - who was unable to find the boundary ropes in a 23-ball innings.
A series of Essex batsman got in and got out, and once Tremlett had hoovered up the tail, Hampshire might have been the more confident team at the break.
But Napier (1-14 from four overs) and David Masters (2-25 in three) swiftly reduced Hampshire to 38-3.
Michael Brown and Sean Ervine attempted a recovery, but Chambers - who also took three outfield catches - removed the dangerous Ervine in his first over.
The Hampshire innings quickly disintegrated and Essex knew victory was theirs long before Nantie Hayward had holed out off Kaneria in the 18th over.