Middlesex's Clydesdale Bank 40 Group A game against Leicestershire at Uxbridge on Sunday is the latest fixture to fall victim to the wet weather.
The game was abandoned an hour before the scheduled start at 1.45pm by umpires Jeremy Lloyds and Martin Bodenham.
With the outfield still saturated from heavy rain on Saturday and overnight, no toss was made and no teams were announced.
Both teams take one point each from the no result, leaving Middlesex, who are second in Group A, on eight points from seven games, three points behind leaders Holland.
Leicestershire, with six points now from eight matches, remain second from bottom in the table and are already out of the running for a semi-final place.