Warwickshire failed to benefit from the presence of England one-day international all-rounder Chris Woakes as their Friends Life t20 quarter-final hopes ended with a 22-run defeat under the Duckworth-Lewis method to Glamorgan in another rain-blighted match at Edgbaston.
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The defeat meant Warwickshire finished level on points with Worcestershire but with an inferior run rate, while Gloucestershire leapfrogged both teams with an eight-wicket win at Northamptonshire.
England released Woakes for Warwickshire's final Midlands/South West/Wales group match but he proved to be their most expensive bowler and took one for 50 in four costly overs.
Chris Wright also came in for some heavy punishment as Shaun Marsh made 68 from 51 balls to help Glamorgan to 173 for five in their 20 overs and Warwickshire were labouring at 61 for four after nine overs when rain halted play.
Umpires Steve Garratt and Trevor Jesty decided that there was no chance of a resumption on an outfield that was still boggy after Friday's rain.
The defeat completed a soggy group campaign for Warwickshire who had four of their five home matches affected by rain.
Glamorgan, who lost half of their 10 group matches to rain, had no chance of reaching the last eight but they completed a double over Warwickshire.
Marsh accelerated after a cautious start with his last 45 runs coming from just 21 balls.
He clobbered three sixes, two straight driven off Woakes in consecutive balls and the other pulled off Wright, before he holed out to deep midwicket off Keith Barker in the penultimate over.
Martin van Jaarsveld helped Marsh add 76 in 10 overs for the third wicket though he had two escapes. Darren Maddy had to parry a catch at deep square leg to avoid carrying the ball over the rope when van Jaarsveld had made seven.
Jim Troughton, running back from cover, fumbled when he collided with the oncoming Maddy when van Jaarsveld had made 22 and the English-qualified South African added 14 more before he drove Wright to long on.
Warwickshire stumbled in reply and wickets fell at regular intervals to seal their fate.