Yorkshire beat Derbyshire by 21 runs to top the North Group and earn a home tie in the Friends Life t20 quarter-finals.
It was their seventh win of the campaign for Yorkshire as they concluded their best ever T20 season, with two no-results and their only defeat being inflicted by Durham by just two runs in the opening match.
Put in to bat by Derbyshire, Yorkshire were given the ideal start with an opening stand of 131 by Adam Lyth and Phil Jaques, a county record for the first wicket, and they never looked back, although the visitors worked hard to restrict them to 180-5, their joint highest score of the season.
The stand went past the previous best for the first wicket of 116, set earlier this season by Andrew Gale and Jaques, and it was just six short of Yorkshire's highest for any wicket - 137 by Gale and Herschelle Gibbs against Durham at Leeds in 2010.
Lyth was caught on the mid-wicket boundary by Wes Durston off Chesney Hughes for 78 from 51 deliveries, and Jaques followed in the next over when Knight had him caught at deep mid-wicket off Alex Hughes for 64 from 47 balls with 10 fours to leave Yorkshire on 150-2 in the 17th over.
Although David Miller and Joe Root both weighed in with sixes, Rana Naved-ul-Hasan prevented a late flow of runs by picking up a couple of wickets.
Derbyshire did little early on in their innings to suggest that they could mount a realistic challenge, Usman Khawaja being caught behind by Gerard Brophy from Richard Pyrah's second ball in the third over and Durston having his leg stump flattened by Mitchell Starc.
Chesney Hughes and Wayne Madsen brought about something of a revival with a 55-run stand in seven overs, but when Hughes was run out the score slipped to 77-4, which soon turned into 99-6.
Chris Durham fell to Starc and Naved was denied sufficient of the strike to continue his onslaught, ending unbeaten on 40 from 22 balls with four sixes, Durham closing on 159-9.