Tom Maynard cracked Glamorgan's fastest ever century but it was not enough as Northamptonshire celebrated their first NatWest Pro40 victory of the season with a six-run win at Colwyn Bay.

When Maynard came to the wicket Glamorgan were 103 for three in the 22nd over needing 269 for victory.

But he cracked a remarkable century in only 57 balls, including four sixes and 14 fours.

However, with 24 needed for victory from 12 balls, Maynard was bowled by Johannes van der Wath in the penultimate over.

The platform for Northamptonshire's victory was Stephen Peters and Niall O'Brien's opening stand of 153 in 24 overs, a one-day record for any wicket at Colwyn Bay.

That set the Steelbacks, who won the toss, on their way to an imposing total of 267 despite four wickets for Robert Croft.

The opening pair, who took the score to 100 from the opening 15 overs, looked completely untroubled as they both cruised to their half centuries in the 17th over.

Peters took 50 balls and O'Brien 52.

But Croft's introduction into the attack turned the innings as he took four wickets for 11 in 17 balls, three of those in the space of six balls.

The breakthrough came when Croft trapped O'Brien in front for 82 from 73 balls.

Andrew Hall lasted only two more balls before the veteran off spinner broke through his defences.

Croft's third wicket arrived when Peters (69 from 69 balls) chipped him straight to Dean Cosker at mid-wicket.

And the former England star, who finished with figures of four for 43, completed his haul by taking a return catch off Alex Wakely.

From 172 for four, Nicky Boje made 43 from 30 balls before skying a return catch to David Harrison in the third over from the end.

Despite a half century from Gareth Rees (73), Glamorgan fell well behind the rate until Maynard injected some much-needed impetus, hitting both Boje and Monty Panesar for straight sixes but he lost Rees, who reverse swept Boje straight to deep point.

Maynard lost partners at regular intervals but earned a standing ovation for his century even though it proved a hopeless cause in the end.