Yorkshire 150 for 5 (Ballance 47) beat Derbyshire 109 (Ashraf 4-18) by 41 runs
Moin Ashraf was the star of the show as Yorkshire claimed their second Friends Life t20 victory against a Derbyshire side who lost for the first time in the North Group.
Ashraf, the 20-year-old pace bowler, took 4 for 18 in a 41-run victory under the Derby floodlights after Gary Ballance had launched a late onslaught with an unbeaten 47 off 35 balls to lift Yorkshire to 150 for 5.
Former Yorkshire spinner David Wainwright had bowled superbly to take 2 for 14 but Ballance struck three sixes as 32 came from the last two overs and the Falcons crumbled to 109 with Rich Pyrah claiming three for 21.
After the teams observed a minute's silence in memory of Surrey batsman Tom Maynard, Yorkshire's innings started well, stalling briefly when Wainwright came into the attack before finishing with a flourish as Ballance finally found his range to take the total past 150.
Although Phil Jacques went cheaply, Andrew Gale was looking dangerous until Wainwright removed his former skipper with his second ball when the opener got under a drive and was caught at deep mid off for 39 off 26 balls.
Wainwright landed another body blow two balls later when he found some sharp turn to have South African batsman David Miller caught at slip and Yorkshire's scoring rate dipped dramatically with only 39 coming from eight overs.
Joe Root was caught behind for 36 trying to reverse sweep Rana Naved-ul-Hasan and when Pyrah was bowled off his pads, the visitors were 107 for 5 in the 17th over. Ballance had struggled to get the ball away but after swinging Rana for the first six of the innings, he pulled Mark Turner for two more as 17 came off the penultimate over.
Rana bowled Ballance with a no-ball that gave Yorkshire a free hit from the final delivery and Ballance took advantage by hitting his third four to give his side a competitive total.
Derbyshire's chase was starting to gain momentum when Mitchell Starc removed his fellow Australian Usman Khawaja when a top-edged pull ended in the gloves of Gerard Brophy and Ashraf trapped Wes Durston lbw in the next over.
Ashraf then bowled Wayne Madsen with another straight and full ball and the force was with Yorkshire when a drive was deflected into the stumps to run out Dan Redfern.
With the asking rate climbing to above nine an over, Ross Whiteley was bowled swinging wildly at Pyrah who yorked Chesney Hughes and had Tom Poynton caught at long off before Ashraf cleaned up the tail.