Jos Buttler began his preparations for England's one-day international series with Sri Lanka later this month by smashing a brutal 91 in Lancashire's Royal London One-Day Cup North Group victory over Warwickshire at Old Trafford.
The wicketkeeper-batsman, playing his fourth match since returning from the Indian Premier League, struck 10 fours and a maximum in an explosive 73-ball innings.
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Martin Guptill and Steven Croft also weighed in with half-centuries, Buttler sharing 122 with the latter for the fifth wicket, as the Red Rose posted 296 for eight after opting to make first use.
That proved 42 runs too many for Warwickshire despite 66 from Jonathan Trott and Ian Bell's 73, Steven Parry and Tom Smith taking three wickets apiece.
Derbyshire claimed their second win in as many matches since the resignation of elite performance director Graeme Welch, following up Friday's NatWest T20 Blast victory against Leicestershire with a seven-wicket triumph over Worcestershire at New Road.
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Hamish Rutherford struck 104 and shared in crucial stands with half-centurions Billy Godleman and Wayne Madsen to chase the hosts' score of 295 in which Alexei Kervezee made 77 and Ross Whiteley hit 61.
Jamie Harrison took career-best List A figures of four for 40 to ensure Durham started their campaign with an 11-run win over Leicestershire at Grace Road.
Durham had posted 340 for six after losing the toss, Mark Stoneman and Phil Mustard adding 180 for the opening wicket, before Harrison helped restrict the hosts to 329 for nine despite Kevin O'Brien's 89 and 63 from Mark Cosgrove.
In the South Group, Gloucestershire's defence started with a nail-biting one-wicket defeat after rivals Somerset's last pair of Jamie Overton and Tim Groenewald put on 65 in 8.1 overs.
The champions were heading for a comfortable victory when they reduced the hosts to 198 for nine in pursuit of 261, in which Chris Dent contributed 100, but Overton and Groenewald gave their side local bragging rights with nerveless scores of 40 and 34 respectively at Taunton.
Kent also squeezed home against last season's runners-up Surrey, Alex Blake hitting a six from the penultimate ball as his unbeaten 66 from number eight helped overhaul Surrey's 255 for eight, which included 58 from Kumar Sangakkara, with one wicket remaining.
Tom Westley struck 110 to inspire Essex, chasing 311, to a three-wicket triumph over Hampshire at the Ageas Bowl.