Yorkshire 252 (Tattersall 71, Thompson 62, Brook 53) and 37 for 0 beat Leicestershire 124 (Coad 5-18) and 161 (Ackermann 47, Thompson 5-31) by 10 wickets
Yorkshire wrapped up a 10-wicket victory over Leicestershire shortly after lunch on day four at Emerald Headingley.
The unbeaten White Rose, boosted by Jordan Thompson's maiden five-wicket haul, secured their third win to go with two draws and moved to the top of the North Group table.
Leicestershire, beginning day four on 78 for 5 in their second innings with a deficit of 50, were bowled out for 161, setting a target of 34.
Openers Adam Lyth and Tom Kohler-Cadmore completed the formalities at 1.30pm, within 6.2 overs of the chase, finishing on 14 and 23 respectively.
Yorkshire did not have things all their own way during a fourth day which started with them eyeing an innings victory.
All-rounder Thompson, 23, completed figures of 5 for 31 from 11 overs with the final two wickets of Leicester's innings.
New ball seamer Ben Coad claimed the first two wickets of the day to finish with match figures of eight for 41.
But Leicester at least made Yorkshire bat again thanks to a 43-run partnership for the eighth wicket between captain Colin Ackermann (47) and fellow South African Dieter Klein.
Klein was dropped twice in the teens on the way to a belligerent 27.
Coad made the breakthrough in the fifth over of the day when Arron Lilley, driving, was caught at fourth slip for 13, leaving the score at 84 for six in the 31st over. And he struck again in his next over to trap Ben Mike lbw (92 for 7).
Duanne Olivier was the victim of one of the Klein drops (Coad at long-leg). But he was cheered when Klein slashed him to backward point, where Thompson held on as Leicester fell to 135 for 8 in the 46th over, a visiting lead of seven.
Thompson's seamers then uprooted Ackermann's off-stump - 139 for 9 in the 49th - before some lusty hitting from last pair Alex Evans and Gavin Griffiths boosted the target.
But Thompson wrapped up the innings by bowling the former in the 51st over, finishing an excellent breakthrough campaign with 234 runs and 15 wickets.
The Foxes finish the Bob Willis Trophy with one win, two losses and two draws.
They were unable to build on a superb opening round victory over Lancashire in a clash at New Road.
Yorkshire will point to the fact that 476 overs have been lost to weather across their three home games, preventing them from pushing for victories against Derbyshire and Lancashire which would have seen them final bound.
Both sides now turn their attention to the Vitality Blast.
They are both in contention to reach the quarter-finals and face each other in the North Group at the Fischer County Ground, Grace Road on Friday (6.30pm).
