Queenslander Lynn struck five sixes and 13 fours in his imperious 59-ball knock to help his side seal a six-wicket win over Warwickshire at Edgbaston, chasing down their target of 209 for the loss of four wickets to maintain their 100 per cent record.
Lynn's fellow Australian, Nathan McSweeney, offered valuable support coming in at No.3 and hitting 19 from 21 balls.
Tasmanian Beau Webster had earlier fallen three runs short of a century in a similarly classy innings for Warwickshire as his 97 from 56 balls took them to 7-208.
Yorkshire suffered their first defeat of the season after losing by 56 runs to Gloucestershire.
Aussie left-hander D'Arcy Short's 50-ball 82, which included five sixes, helped the visitors to 6-217 from their 20 overs.
Englishman Adam Lyth was on a one-man mission to chase the target at the top of the order, thumping 97 from 56 balls, but there was not a lot behind him and Yorkshire were bowled out for 161 in the 18th over, with Aussie veteran Andrew Tye out for one.
Kent put in a dominant display to beat Surrey by eight wickets at the Oval. Bowling first, they restricted the hosts to just 116 all out, with Jake Lintott taking 3-19.
They then chased that down in just 14 overs as Harry Finch hit 64 and Sam Billings made 42.
Nottinghamshire opener George Munsey fired an unbeaten 88 to steer his side to a six-wicket win over Durham at Trent Bridge.
The visitors were restricted to 8-156 from their allocation, but Munsey's innings saw Nottinghamshire home with 16 balls to spare.
Hampshire cantered to an eight-wicket win over Middlesex with Zimbabwe-born Australian Hilton Cartwright (29no off 13) playing his part.
A disciplined bowling display saw the visitors reduce the hosts to 7-126 and they then made light of the target, helping chasing it down in 14 overs.
Charlie Allison sored 67 and guided Essex over the line as they won by five wickets with two balls remaining against Derbyshire for whom Aussie left-hander Caleb Jewell hit 14 off as many balls.
