Naved-ul-Hasan blasted 53 off 23 balls to see Yorkshire to a four-wicket victory over Surrey at the Brit Oval.
The Pakistan all-rounder shared an unbroken seventh-wicket stand of 73 with Adil Rashid as the Tykes chased down a target of 330 with two balls to spare.
Although this final match of the Friends Provident Trophy Group C was a dead rubber, with neither side able to qualify for the knock-out stages, the two teams still produced a dramatic game.
A limited overs career-best by Surrey's left-handed opener Scott Newman (177) helped the Brown Caps amass 329-8, their highest limited overs score of the season.
After the early loss of Joe Sayers, Yorkshire gave the pursuit their best shot with steady top-order contributions as they set out needing to score at over a run-a-ball.
Jacques Rudolph (37) fell when reverse sweeping then, after an 88-run stand with left-hander Adam Lyth, Michael Vaughan went for 74 scored off only 69 balls.
Having cantered to a 50 from 54 deliveries the former England skipper accumulated eight fours and a brace of sixes before missing a full-length ball from Alex Tudor to go lbw.
The pugnacious Lyth reached his half-century at a run-a-ball and had top-scored with 88 when he clipped to long-on to leave his side wobbling at 256 for six.
But Naved found a willing partner in Rashid and between them the seventh-wicket partners snatched the game from Surrey's grasp with a match-winning stand.
Rashid contributed an unbeaten 35, yet they still required 18 to win off Andre Nel's final over of the game.
Naved made light work of that, however, hitting his first ball over long-off for six.
He then sliced the second ball to the ropes at point, pulled the third for four through midwicket, before the fourth was dispatched to thud into the boards at deep extra-cover and send Yorkshire into raptures.
Earlier, Newman's sublime three-hour stay included 19 fours and four sixes and represented the fourth-best individual one-day innings by a Surrey batsman.
Their total would have been bigger but for a bizarre collapse in the quest for late runs that saw Surrey lose five wickets for one run in the space of eight balls and ultimately the Brown Caps decision to rest in-form Mark Ramprakash proved costly.
Newman featured in an opening stand of 73 with Michael Brown before embarking on a second-wicket record partnership for Surrey against the Tykes worth 211 in 30 overs with Australian-born Stuart Walters.
The pair were particularly savage on England leg-spin prospect Rashid who conceded three sixes in as many overs. The pair went on to blast a further 63 in their five-over batting powerplay.
They duly beat Surrey's previous best second-wicket stand against Yorkshire of 160 by Graham Thorpe and Alistair Brown scored in Scarborough back in 1994 and looked set for the county's second-wicket record overall until Anthony McGrath pulled off an athletic diving catch that sent Walters packing for 85.
To their credit Yorkshire, though somewhat lacklustre in the field, hit back through the joint seam threat of Deon Kruis and Rana, who finished with three wickets apiece after Surrey's late collapse.
Newman's 156-ball stay eventually ended when he holed out to long-on where Rashid extracted some revenge for his earlier pummelling by taking a well-judged catch.