Durham wicketkeeper Phil Mustard cracked an unbeaten 52 off 29 balls to steer his side to an eight-wicket win against holders Leicestershire in the Twenty20 Cup tie at Chester-le-Street.
The match was reduced to 13 overs per innings but Durham, chasing 99 to win after the Foxes' 98 for six, got home with two overs to spare.
Mustard drove the last two balls of the 11th over for six, leaving Garnett Kruger with none for 35 from two overs.
With 20 needed at the start of his second over, Leicestershire were still in the hunt in a match in which both sides got off to a flying start and were pegged back by the slower bowlers.
Durham lost New Zealander Scott Styris before the start with a calf strain and seemed certain to miss him as the holders had 42 on the board after three overs, but they added only 56 to finish on 98 for six.
Steve Harmison, who bowled three leg-side wides in his allotted three overs, conceded 17 off the game's second over and Ottis Gibson 18 off the third.
But Harmison then took two wickets to transform the game and five overs of off-spin from Gareth Breese and Paul Wiseman cost only 25 runs.
In the Durham innings three overs of seam at the start produced 41 runs, during which Mustard hit David Masters over long-on for a huge six.
But the loss of Michael Di Venuto and Dale Benkenstein in the second and fourth overs, followed by the introduction of left-arm spinner Claude Henderson slowed things down.
Both teams were on 60 after seven overs, and some excellent running by Mustard and Will Smith helped to keep Durham on target. Smith contributed 24 off 25 balls to an unbroken stand of 58.
Following a torrential downpour at 3.30pm the start was delayed by an hour until 7pm, when Leicestershire won the toss and chose to bat in bright sunshine.
Harmison tried to bowl aggressively with two slips posted, but his second and fourth balls were leg-side wides.
Paul Harrison gave Leicestershire their brisk start with two sixes over long-on off Gibson in his 26 off 13 balls. But nobody else got to 20 as the off-spinners stemmed the flow, helped by three tight overs from Neil Killeen.