Gordon Muchall hit an unbeaten 66 as Durham beat Derbyshire by 37 runs to keep alive their hopes of reaching the Friends Life t20 quarter-finals.
Muchall's innings off just 36 balls, including four fours and three sixes, saw the hosts amass 187-3 at Emirates ICG on Sunday and Derbyshire could only muster 150 all out in their reply, with seven balls unused.
It was a fourth successive win for the Dynamos, who must now wait to discover whether they have qualified for the quarter-finals as one of the two best third-placed teams.
Durham were penalised 0.25 points for a salary-cap breach last season, leaving them third in the North Group on 11.75.
They now need either defeat for Glamorgan or a no-result between Warwickshire and Somerset in the Midlands, West and Wales Group, or both Essex and Middlesex to lose in the South Group, to see them through as one of the two best third-placed teams.
After being put in, Muchall's Twenty20 best of 66 not out earned him the man of the match award. There were three sixes in his 26-ball half-century and his stand of 79 in just under seven overs with Scott Borthwick virtually put the game beyond Derbyshire.
They looked like making a fight of it as they sped to 42 in the first four overs of their reply, but the challenge faded after Chesney Hughes went down the pitch and was stumped for 34 in Gareth Breese's first over.
The West Indian left-hander hit seven fours in his 22-ball knock, but the only other significant contribution came from Dan Redfern.
He made 43 off 34 balls before falling to a stunning diving catch at long-off by Ben Stokes, who also showed his athleticism with a sharp piece of fielding off his own bowling to run out Alex Hughes.
Phil Mustard, playing his 100th Twenty20 game for Durham, contributed 24 from 21 balls to an opening stand of 54 with acting captain Mark Stoneman, who went on to make 47.
His exit brought in Muchall at 83-2 in the 11th over and two overs later he drove two successive balls from Wes Durston over long-on for six then also cleared the rope off Redfern.
Stokes, the competition's leading six-hitter with 18, was unable to add to his tally. He made 10 not out after going in when Borthwick fell for 31 in the 18th over.