Paul Collingwood made his highest one-day score for two years to help Durham record a 43-run victory over Derbyshire under the Duckworth-Lewis method.
Former England international Collingwood made 79 to help Durham post 273-6 at Chester-le-Street; Derbyshire were 70-3 off 16 overs when rain cut short their reply.
The hosts took 69 off the last six overs of their innings to boost their final total, Gordon Muchall contributing an unbeaten 57 from just 34 deliveries.
Scott Borthwick made 43 and Ben Stokes 40, both scoring at around a run a ball, although the latter was fortunate to be dropped at deep mid-wicket when he had just 14 to his name.
Stokes drove two straight fours in an over which cost 14 from Mark Turner then hammered a straight six off left-arm spinner David Wainwright before driving Mark Footitt (3-55) to mid-off.
Derbyshire were given a quick start when Chesney Hughes hit Graham Onions' third and fourth balls for four, only to then fall lbw to the fifth.
Shivnarine Chanderpaul made 11 before he played back and edged to Mustard in the seventh over and in Onions' final over Paul Borrington departed for 32 when he pulled a catch to mid-wicket.
Visiting skipper Wayne Madsen was 10 not out while Billy Godleman was yet to get off the mark when steady drizzle took the players from the field.