Worcestershire, Derbyshire & Essex top groups
Warwickshire close on 228-3 at Pears - Rhodes 142*
Somerset rally to 237 before Glos close on 13-4
Day one of Roses match abandoned with Yorkshire 8-0
No play between Hampshire & Essex due to wet outfield
Two group winners with most points play five-day final at Lord's in September
Surrey v Kent 10-0
Kent are one of half a dozen sides still in with a realistic chance of going through to the final.
Surrey... well, they've lost all three games and have the fewest points of any of the 18 counties.
Sam Curran returns from England duty for the hosts at The Oval, but Jason Roy sits out.
Kent openers Daniel Bell-Drummond and Jordan Cox have seen out the opening few overs from Curran and Matt Dunn.
Byrom b Payne 0 (Somerset 4-1 v Gloucestershire)
Somerset's top order have struggled so far this season and they've been sent in by the Glosters for the first first-class Cider Derby since 2007.
Early strike for the visitors, David Payne in his second over clipping Eddie Byrom's off stump. A real beauty that shaped away.
Image source, Getty ImagesDickson lbw b Conners 0 (Durham 7-1 v Derbys)
Early wicket for North Group leaders Derbyshire!
Seamer Sam Conners smacks Durham opener Sean Dickson on the pad and he's sent on his way.
Yorkshire v Lancashire (11:30 BST)
Image source, Rex FeaturesThey've flicked the coin at Headingley, Steven Patterson has called correctly and Yorkshire will have a bat.
The Roses match gets under way at 11:30 BST.
Durham 0-0 v Derbyshire
Perhaps the surprise package of the tournament so far have been Derbyshire, who top the North Group after winning two of their three matches.
Another win against bottom side Durham at Chester-le-Street and they could well have one foot in the Lord's final.
Alex Lees and Sean Dickson are opening for the hosts, Sam Conners has the new cherry for the visitors.
Bob Willis Trophy - day one
So, there will be delayed starts between Yorkshire and Lancashire and Hampshire and Essex.
Thankfully the rain has cleared from Headingley and they're hoping to get under way at 11:30 BST with a toss at 11:00.
The news isn't quite as encouraging at Arundel where there's a bit of rain in the air still and they'll have an inspection at 11:30.
All of the seven other games are about to start though...
Every ball covered
As ever there is ball-by-ball BBC radio commentary from all nine games.
To tune in, click on your desired link at the top of this page.
Bob Willis Trophy - day one
North Group:
Durham v Derbyshire - Derbys bowling
Leics v Notts - Notts bowling
Yorkshire v Lancashire - toss delayed, 11:30 BST start
Central Group:
Northants v Glamorgan - Northants bowling
Somerset v Gloucs - Gloucs bowling
Worcs v Warwickshire - Worcs bowling
South Group:
Hampshire v Essex - toss delayed, 11:30 inspection
Middlesex v Sussex - Sussex bowling
Surrey v Kent - Surrey bowling
Bob Willis Trophy - day one
Just one point separates leaders Worcestershire and second-placed Somerset.
Worcestershire beat Northants last time out, while Somerset were cheated by the Edgbaston rain needing just a couple more Warwickshire wickets for a big victory.
Image source, .Bob Willis Trophy - day one
Essex are the only side in the competition who have won all three games. They travel to Arundel this week to face Hampshire. Cracker.
Image source, .Bob Willis Trophy - day one
Derbyshire lead the way in the North Group following their rain-hit draw against second-placed Yorkshire in round three.
This week sees a Roses clash between Yorkshire and Lancashire at Headingley. We'll be keeping a close eye on that one.
Image source, .
Image source, Rex FeaturesThe two group winners with the most points will contest the five-day final, so let's have a look at how things stand in the North, South and Central groups...
Image source, Rex FeaturesMorning!
Welcome to round four of five in the Bob Willis Trophy.
Over the next four days we're likely to find out who's still in the running to make the Lord's final next month.
Ball-by-ball radio commentary from all nine games, along with live text coverage coming right up...