When the big-hitting Jacques du Toit also fell cheaply to a superb delivery from Killeen, the Foxes were in trouble, and it needed an outstanding effort from Dippenaar to give the innings some semblance of a total.

There was no one else able to give him any support, however, with six of the side failing to reach double figures.

Claydon and Harmison bowled superbly, with Claydon taking three wickets for 14 runs and Harmison three for 28, as the Foxes managed just 33 runs off the middle five overs of the innings and 40 off the final 10.

Dippenaar, having made his first half- century in the competition, was finally out for 63 off 48 balls with a six and seven fours, edging a catch to Mustard off Killeen. Warner and Mustard then set the tone of the Dynamos’ reply with a magnificent opening partnership during the first seven overs.

Warner was in superb form, and when he was finally caught at deep midwicket he had blasted three sixes and five fours.

The left-hander eventually fell to left- arm spinner Claude Henderson, who then claimed the wickets of Mustard and Kyle Coetzer to finish with three for 32.

But it was all in vain for the Foxes as Durham eased to victory, with Dale Benkenstein hitting the winning boundary off the second ball of the 17th over to take the Dynamos into the quarter-finals, where they face a trip to Kent Spitfires.

In the other quarter-finals, Lancashire play host to Somerset, Northants face the visit of Hampshire while Warwickshire travel to Sussex. All matches will be played on either July 27, 28 or 29.