The Clydesdale Bank 40 clash between Middlesex and Worcestershire at Uxbridge ended in dramatic circumstances, with both sides making 229 to leave the match tied.
Eoin Morgan sparkled with an unbeaten 120 off 80 balls as the hosts posted 229 for four from their 36 overs. In reply, Worcestershire slipped to 19 for two before Phil Hughes and Daryl Mitchell put the visitors back in contention with a third wicket stand of 96 in 18 overs.
Worcestershire needed an unlikely 24 off the final over - but former Middlesex man Ben Scott hit a four and three sixes off Steven Crook to leave the visitors needing two off the last ball. Neil Dexter dived forward at mid-on and spilled a difficult catch - and Adam Scott scrambled through for a single to ensure the spoils were shared.
Meanwhile, Essex eased to a comfortable seven-wicket victory over Leicestershire in their bottom of Group A clash at Chelmsford.
In a match reduced to 25 overs each because of rain, the hosts surpassed Leicestershire's 151 for seven with nine deliveries to spare. Owais Shah led the way for Essex with an unbeaten 45 from 46 deliveries, which included three fours and a six.
A tight final over from Jim Allenby earned Glamorgan a two-run victory over Nottinghamshire under the Duckworth-Lewis Method in a rain-affected clash at Swansea.
The defeat meant the Outlaws failed to take the opportunity of going top of Group B, while Glamorgan maintain their slim hopes of qualification for the semi-finals. Nottinghamshire had reached 77 for four in 18 overs in pursuit of 182 to win when rain interrupted play for more than an hour.
When play restarted the Outlaws were required to reach 110 to win, meaning they need 33 off the final three overs. Samit Patel and Chris Read managed 13 from Allenby's first over and six came from the first five balls of Graham Wagg's final over before Patel was caught at long-on off the final delivery.
That left the visitors requiring 13 from Allenby's final over - but Read and Scott Elstone could only manage five from the first five balls to give the Dragons victory. Read did hit a six off the final ball - but it was purely a consolation.
Rain caused problems elsewhere as Scotland's Group B clash against Durham at Uddingston was abandoned with a ball bowled.