Yorkshire 320 for 7 (Tattersall 70, Hill 64, Ballance 54, Waite 42*) beat Warwickshire 281 (Bethell 66, Mousley 61, Coad 3-30, Hill 3-47) by 39 runs
Matthew Waite smashed 42 unbeaten off 16 balls and claimed two new-ball wickets as Yorkshire secured a high-scoring Royal London Cup win over Warwickshire at York.
The Vikings slipped to 0 for 2 after four balls of Clifton Park's first List A fixture before recovering to 320 for 7 as Waite took the lion's share of 32 from the final over of the innings.
The Bears then recovered from 134 for 5 in the 30th over as youngsters Jacob Bethell and Dan Mousley hit quick-fire scores of 66 and 61 and shared 115 before being bowled out for 281 inside 48 overs - defeated by 39 runs.
Yorkshire secured their second Group B win in five matches to keep alive their knockout hopes, while Warwickshire lost for the third time in five.
Ballance made 54 off 71 balls on an excellent pitch having lost Yorkshire's fifth successive toss, Hill 64 off 65 and Tattersall 70 off 67. But their standout innings came from Waite, who crashed four sixes and three fours in front of a 3,000 strong crowd. Three of those fours and three sixes came off Ethan Brookes in the final over, which started with a no ball.
The Vikings had been plunged into early trouble as impressive George Garrett had Will Fraine caught behind with the first ball of the match before Will Luxton top-edged a pull to mid-off.
Ballance shared 89 for the third wicket with opener Harry Duke, who contributed 42. Hill and Tattersall later advanced from 114 for 4 in the 24th over with a 110-run partnership to set the platform for late fireworks. Tattersall's was his first Yorkshire fifty of the summer.
Warwickshire were hurt by a hamstring injury for Garrett, limiting him to seven overs and 2 for 24.
Waite then continued his excellent day by getting openers Rob Yates and Ed Pollock inside 10 overs of Warwickshire's chase - 49 for 2. Yates miscued a pull to mid-off and Pollock uppercut the final ball of the 10th to third, having just hit successive sixes to leg.
Warwickshire's captain and keeper, Will Rhodes and Michael Burgess, shared a steadying 62 for the third wicket. However, they both fell in a damaging loss of three wickets for 23 as the score slipped to 134 for 5 in the 30th - Rhodes run out for 37 and Burgess bowled by Hill for 33.
But Yorkshire's dominance at that stage was eroded significantly by 17-year-old Bethell and Burgess, 20, as the sixth-wicket pair shared 115 in 12 overs - a Bears record in List A cricket versus the White Rose. Bethell reached his swashbuckling maiden List A fifty off only 27 balls and went on to hit four sixes. And when he miscued Duanne Olivier to cover, the game was back in the balance at 249 for 6 in the 42nd.
Despite Mousley passing 50 and remaining unbeaten, Yorkshire were able to squeeze and hold their nerve. Hill finished with a career-best 3 for 47, added to 3 for 30 from miserly Ben Coad.