Derbyshire Falcons' Friends Life t20 match with Nottinghamshire Outlaws has been cancelled due to a waterlogged County Ground.
Umpire David Millns carried out a morning inspection and judged the outfield was too waterlogged for there to be any prospect of play beginning at the scheduled 6pm start time.
Both teams are awarded one point for the cancelled fixture, leaving Nottinghamshire all but qualified for the quarter-finals, whereas Derbyshire are unable to finish high enough in the North Group to join them.
Leicestershire Foxes' final home game against Durham Dynamos at Grace Road has been also been rained off.
With one point each, the Foxes are still rooted to the bottom of the group table with just two wins from nine games after lifting the trophy last season.
Although the Dynamos cannot finish in the top two, they still have a chance of qualifying for the quarter-finals as one of the best two third-placed teams if they can beat Lancashire Lightning on Sunday when they have home advantage.
Edgbaston's soggy summer continued when Warwickshire's match against Gloucestershire was abandoned, with Worcestershire's scheduled encounter with Northamptonshire going the same way.
Heavy rain prevented any play in this evening's floodlit Friends Life t20 match between Lancashire and Yorkshire at Old Trafford.
The washout is another blow to Lancashire's hopes of qualifying for the quarter-finals. Glen Chapple's side must now win at Durham on Sunday and hope results in the other two groups go their way.
By contrast, North Division leaders Yorkshire have already secured a place in the last eight and will secure a home tie if they beat Derbyshire at Headingley on Sunday.