Glamorgan fell just short in a brave attempt to wrap up Group B at Leicester with a game to spare.
Australia’s Peter Handscomb hit 103, rescuing last year’s winners Leicestershire from 59-5 as the hosts totalled 271-8, after seamer Timm van der Gugten had taken 5-49.
After 68 from Colin Ingram and a stunning late-order 61 from Dan Douthwaite, Glamorgan got close, still needing 31 when the penultimate wicket went, only to whittle the target down to 10 off 10 balls.
But they were bowled out for 262, Foxes left-arm spinner Liam Trevaskis taking 4-54, backed by ex-Glamorgan man Roman Walker, who took the last three wickets to earn a nine-run win.
Warwickshire also suffered their first defeat as they lost at home to Yorkshire at Rugby School.
Rob Yates made 72 as the Bears completed their innings on 242-9, pegged by a limited-overs best 6-28 from George Hill – Yorkshire’s seventh-best List A figures.
But the Tykes were always in control in their reply, sparked by a rapid 60 from Harry Duke, followed by an unbroken 129-run stand between centurion Will Luxton, who made 105, and Matthew Revis who was also still there at the end on 51 as Yorkshire won with 33 balls to spare.
The Bears are back at Rugby School on Wednesday to face Nottinghamshire in their final game, while Yorkshire remain on the road to finish against Glamorgan in Cardiff.
