With two needed off the last ball for victory, Patel was run out by Adam Ball and Kent won by one run. The New Zealander - batting at number nine - came in when the game looked all but over for his side at 192 for seven, chasing 239, but he almost single-handedly brought his team back into the match with 50 from 27 balls, before coming up just short.
Earlier Brendan Nash made 98 not out for Kent, while Varun Chopra gave Warwickshire a solid start to their innings with 65.
Durham's impressive early-season form continued as they eased to victory over Lancashire in their Group B clash at Old Trafford. After losing to Essex on Sunday, Paul Collingwood's side needed a response and the LV= County Championship's early pacesetters gave one in Lancashire as they won by five wickets.
Opener Phil Mustard led the way with 91 from 86 balls, ably supported by opening partner Mark Stoneman who smashed 32 from 24 as Durham went at 10 an over during the first powerplay. It set the platform for the rest of the innings as they chased down the hosts' 217 with 31 balls to spare.
Steven Davies smashed an unbeaten 127 to lead Surrey to a nine-wicket triumph over defending champions Hampshire at The Oval.
The opener took just 104 balls in an innings which included 10 fours and a maximum, while skipper Graeme Smith made 74 as the the home team reached their target with 55 balls remaining.
Zafar Ansari had starred with the ball for Surrey, taking four for 46 from his eight overs, with Sean Ervine's 63 not enough for the visitors.
A sensational century from Marcus North helped Glamorgan to a 26-run win over Middlesex at Lord's. The Australian plundered 137 runs from just 98 balls in a knock which included 16 fours and three sixes.
Will Bragg (62) and Jim Allenby (69 not out) offered good support to help the Welsh side to 280. It was too much for a spirited Middlesex who were led by Gareth Berg's 75, but fell short, making 254 for nine, while Unicorns' awful start to the competition continued as they stumbled to a nine-wicket defeat against Gloucestershire in Wormsley.