Three semi-final spots up for grabs
There is still plenty to be decided heading into the final round of Clydesdale Bank 40 group games tomorrow, with Surrey the only team to have confirmed their place in the semi-finals.
Rory Hamilton-Brown’s side have taken Group B by storm this year and remain unbeaten, having won 10 of their 11 matches with one no-result.
They take on their nearest challengers, Durham with the north-east county knowing anything other than a defeat will guarantee their progression to the last four as the leading runners-up.
Surrey have named newly-signed India spinner Pragyan Ojha in their squad, meaning fellow overseas player Yasir Arafat misses out. Chris Jordan is set to feature in place of Jade Dernbach, one of 13 players preparing for the NatWest International T20 with India on Wednesday - including Durham's Ben Stokes but not rested Surrey's Kevin Pietersen.
Elsewhere in Group B, Hampshire take on Scotland and Warwickshire host Northamptonshire, but there is little riding on either match.
Hampshire and Scotland have both named young squads with batsmen Adam Rouse, who can also keep wicket although Michael Bates is set to retain that role, and Tim Ravenscroft in line for first competitive starts for the Royals, who rest Neil McKenzie and Sean Ervine but have seamer David Griffiths back from injury.
Scotland are without Fraser Watts due to work commitments and the injured Luke Butterworth, who is replaced by fellow overseas player George Worker. Batsman Ryan Flannigan and wicketkeeper Craig Wallace come in.
Somerset have all but secured top spot in Group C following their 59-run victory over Gloucestershire at Bristol on Wednesday.
Last year’s runners-up hold a two-point advantage over Essex, their opponents at Taunton tomorrow, and Nottinghamshire, but boast a significantly better net run-rate.
Essex or Nottinghamshire, who welcome Lancashire to Trent Bridge, could yet pip Durham to the best runners-up spot should they win their final group games, providing the Dynamos are beaten at the Kia Oval.
The Eagles have rested Owais Shah and David Masters with Jaik Mickleburgh, Tymal Mills and Tom Craddock in line to play.
The other Group C game sees the Unicorns, who have yet to win a match in the competition this year, host Glamorgan at Wormsley.
Dragons batsman Gareth Rees is the leading scorer in the CB40 with 566 runs at an average of 63 and will doubtless be keen to finish on a high. Aneurin Norman, a 20-year-old all-rounder, could make his senior Glamorgan debut after being named in their squad.
In Group A, Sussex appear almost certain to qualify, despite slipping to a 14-run defeat at Kent last time out, their second loss in a row.
The Sharks, still without injured all-rounder Luke Wright, currently hold a two-point lead over Middlesex, whom they face in their final match at Lord’s.
However, even a Middlesex win is unlikely to deny Sussex a place in the semi-finals, due to the Sharks' vastly superior net run-rate. Middlesex are unable to qualify as the best second-placed team and cannot field on-loan Ollie Rayner against his parent club.
Kent can overhaul Middlesex if they beat Derbyshire at Canterbury, while the group’s bottom two sides, Yorkshire and Worcestershire, meet at Headingley Carnegie. Yorkshire leg-spinner Adil Rashid is the competition's joint-leading wicket-taker with Shane Mott, an overseas player for the Netherlands who have played their last group game.