Glamorgan 299 for 3 (Ingram 115*, Carlson 65) beat Derbyshire 298 for 8 (Came 73, Reece 69, Haider Ali 63) by seven wickets
It had promised to be a better day for Derbyshire when Reece and Came began to accelerate with Came pulling a free hit from Ben Morris for the first six of the innings in the 11th over.
A scoop over the wicketkeeper took Reece to his 50 from 52 balls but after he was hit on his right elbow by a throw, he scored only four more runs before he came down the pitch and was stumped to give Ben Kellaway his first List A wicket.
Kellaway was involved again when his direct hit from backward point ran out Came and then struck Alex Horton a painful blow on the ankle which left the wicketkeeper requiring treatment before he could continue.
By then, Ali was starting to bruise the bowler’s figures, pulling and driving two big sixes on his way to a 42 ball fifty.
Kellaway was hoisted onto the pavilion roof but after cutting the off-spinner for his fifth four, Ali sliced a big drive and was caught at point.
From then on the innings went into decline with Matt Lamb missing an expansive drive and Tom Wood lbw trying to shovel Kiran Carlson through mid-wicket.
Brooke Guest was well caught on the run at mid-wicket and Anuj Dal was bowled attempting to scoop Andy Gorvin.
Derbyshire had fallen well short of what looked likely six overs earlier but some improvisation from Sam Conners and a six by Alex Thomson off the final ball of the innings took them to their highest Lisa A score against Glamorgan.
The visitors established a solid base but after Tom Bevan drove a Nick Potts no ball for four and pulled the free hit for six, both openers went in consecutive overs.
Bevan skied Dal to deep mid-wicket and Eddie Byrom was caught behind trying to steer Potts to third man.
But Ingram and Carlson kept Glamorgan ahead of the required rate and after a short rain break, Ingram carved Conners over cover for six to take his side to 142 for 2 at the halfway point.
Carlson pulled Wood for six to reach 50 from 40 balls but when he tried to sweep Thomson, he got a top edge and was caught at short fine leg.
But Ingram made sure there was no late drama as he and Root secured Glamorgan’s first victory in the competition to send Derbyshire sliding to a second defeat.