And we're almost done for the first day with Glamorgan and Warwickshire just about to start the last over at Sophia Gardens.
Stayed tuned - we'll show you all the scores at stumps in a short while...
Close of play at Aigburth
Lancashire 206-8 v Derbyshire
Stumps in Liverpool. I'd call that Derbyshire's day although you never know until both sides have batted.
Derbyshire of course realistically need to win, to grab a place in the Bob Willis Trophy final.
Close of play at The Oval
Surrey v Sussex 239-3
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Surrey may have packed their side with some big names for this game, but the day belongs to Sussex opener Tom Haines with his unbeaten 105 off 216 balls.
Delray Rawlins also caught the eye with his 65 off 88 balls after a promotion up the order.
Sussex will resume on the second day on 239-3.
Post update
Lancashire 201-8
Four byes bring the 200 up for Lancashire.
Both batsman, Tom Hartley and Jack Morley, are yet to get off the mark.
Not long to go now, just 18 deliveries remain.
Buttler's unbeaten 77 gives England win
Second T20 international: England beat Australia by six wickets
Meanwhile, in case you weren't aware, England have just beaten Australia by six wickets in the second T20 international at the Ageas Bowl to seal a series win with a match to spare.
You can read the full report below and follow more post-match reaction right now live on BBC One.
Lamb c du Plooy b Critchley 8 (Lancashire 197-8 v Derbys)
Now Danny Lamb departs, slicing Matthew Critchley to point.
Can Derbyshire wrap this up before stumps in four overs time?
WICKET
Balderson c Madsen b Conners 36 (Lancashire 197-7 v Derbys)
And there is the wicket of George Balderson.
The England Under-19 international makes his First-Class best of 36, but is caught at slip attempting to cut Sam Conners.
Five overs to go.
Close of play at Canterbury
Kent 21-2 v Hampshire 191
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All done for the day in the Garden of England.
Kent lose a couple of late wickets which means England's Zak Crawley has to come out and face seven balls in the gloom, which he survives without getting off the mark.
Matt Milnes does his job as nightwatchman at the other end.
Kent close on 21-2 still 170 runs behind with eight wickets in hand after earlier dismissing Hampshire for 191.
Darren Stevens' 29th first-class career five-wicket haul and six catches from wicketkeeper Ollie Robinson helped do the damage.
Post update
Lancashire 197-6 v Derbyshire
We've still got seven overs left in Liverpool after the delayed start this morning.
George Balderson has been brilliant in defence, notching up 36 from 126 deliveries. He's joined by Danny Lamb who has right from 27.
Remember, Derbyshire need to win this game to give themselves the best chance of making the final.
Close of play at Chelmsford
Essex 108-5 v Middlesex 138
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Stumps on an eventful first day between Essex and Middlesex.
Essex close 30 runs behind the visitors with five wickets in hand after 15 in total fell in the day.
Ryan ten Doeschate (28 not out) and Adam Wheater (18 not out) will resume in the morning as the South Group leaders eye some batting bonus points.
Close of play at New Road
Worcestershire 14-0 v Somerset 251
Craig Overton can't nab a late wicket and Jake Libby and Daryl Mitchell survive until the close.
A big day two for both sides tomorrow then with the winner of this tie topping the central group.
And another wicket for Hampshire!
Kent 20-2 v Hampshire 191
Two wickets in the space of two overs for Hampshire at Canterbury.
Daniel Bell-Drummond is comprehensively bowled by Ian Holland for 16 to leave Kent on 20-2.
WICKET
Cox c Alsop b Currie 2 (Kent 20-1 v Hampshire 191)
Hampshire pick up a wicket late in the day at Canterbury.
Kent opener Jordan Cox departs for just two as he edges Scott Currie to Tom Alsop at second slip.
Matt Milnes strides out as nightwatchman for the hosts.
100 for Tom Haines
Surrey v Sussex 217-2
We've not mentioned much of what's happening at The Oval today with neither side able to qualify for the final.
But young Sussex opener Tom Haines has plenty of reasons for a mention as he brings up a century from 186 balls, which has included 13 fours.
He and Delray Rawlins (58 not out) have added 108 for the third wicket so far.
Close of play at Headingley
Yorkshire 36-2 v Leicestershire 124
All done for the day in Leeds after rain unfortunately meant no more play was possible after 16:00 BST.
Yorkshire will hope to resume in the morning without any further delay on 36-2, still 88 runs behind Leicestershire's 124.
Ben Coad took the plaudits earlier in the day with his 5-18 with the ball.
Post update
Worcestershire 5-0 v Somerset 251
Daryl Mitchell and Jake Libby come to the crease at New Road with just four overs left before stumps.
Can Somerset grab a late, late wicket?
Watchful start by Kent
Kent 14-0 v Hampshire 191
Daniel Bell-Drummond (10 not out) and Jordan Cox (2 not out) have made a patient start to Kent's reply so far as we move towards the close of the first day.
Ian Holland and Brad Wheal testing them both out with the new ball so far.
Post update
We're now into the closing stages of day one in the Bob Willis Trophy.
We could have some crucial wickets in the last few overs...
Live Reporting
Adam Williams and Josef Rindl
All times stated are UK
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Latest PostThanks for joining us
And that is your lot for this eventful (in more ways than one!) first day of this round of the Bob Willis Trophy.
Plenty to talk about and to react to. In case there's anything you might have missed, check out the Counties page of the BBC Sport website and app for full reports from today's play.
Meanwhile, we'll be back for day two on Monday from around 10:15 BST.
Until then - thanks for being with us!
Close of play scores
North Group:
Aigburth: Lancashire 206-8 v Derbyshire - Lancashire won toss and elected to bat
Trent Bridge: Nottinghamshire v Durham 275-8 - Durham won the toss and elected to bat
Headingley: Yorkshire 36-2 v Leicestershire 124 - Yorkshire won the toss and elected to bowl
Central Group:
Cardiff: Glamorgan 4-1 v Warwickshire 186 - Glamorgan won the toss and elected to bowl
Bristol: Gloucestershire 66-6 v Northamptonshire - match abandoned after lunch due to Covid-19 related reasons.
Worcester: Worcestershire 14-0 v Somerset 251 - Somerset won the toss and elected to bat
South Group:
The Oval: Surrey v Sussex 239-3 - Sussex won toss and elected to bat
Chelmsford: Essex 108-5 v Middlesex 138 - Middlesex won the toss and elected to bat
Canterbury: Kent 21-2 v Hampshire 191 - Kent won the toss and elected to bowl
Post update
And we're almost done for the first day with Glamorgan and Warwickshire just about to start the last over at Sophia Gardens.
Stayed tuned - we'll show you all the scores at stumps in a short while...
Close of play at Aigburth
Lancashire 206-8 v Derbyshire
Stumps in Liverpool. I'd call that Derbyshire's day although you never know until both sides have batted.
Derbyshire of course realistically need to win, to grab a place in the Bob Willis Trophy final.
Close of play at The Oval
Surrey v Sussex 239-3
Surrey may have packed their side with some big names for this game, but the day belongs to Sussex opener Tom Haines with his unbeaten 105 off 216 balls.
Delray Rawlins also caught the eye with his 65 off 88 balls after a promotion up the order.
Sussex will resume on the second day on 239-3.
Post update
Lancashire 201-8
Four byes bring the 200 up for Lancashire.
Both batsman, Tom Hartley and Jack Morley, are yet to get off the mark.
Not long to go now, just 18 deliveries remain.
Buttler's unbeaten 77 gives England win
Second T20 international: England beat Australia by six wickets
Meanwhile, in case you weren't aware, England have just beaten Australia by six wickets in the second T20 international at the Ageas Bowl to seal a series win with a match to spare.
You can read the full report below and follow more post-match reaction right now live on BBC One.
Buttler guides England to series win
Jos Buttler guides England to a six-wicket victory over Australia in the second Twenty20 international to clinch the three-match series.
Read moreWICKET
Lamb c du Plooy b Critchley 8 (Lancashire 197-8 v Derbys)
Now Danny Lamb departs, slicing Matthew Critchley to point.
Can Derbyshire wrap this up before stumps in four overs time?
WICKET
Balderson c Madsen b Conners 36 (Lancashire 197-7 v Derbys)
And there is the wicket of George Balderson.
The England Under-19 international makes his First-Class best of 36, but is caught at slip attempting to cut Sam Conners.
Five overs to go.
Close of play at Canterbury
Kent 21-2 v Hampshire 191
All done for the day in the Garden of England.
Kent lose a couple of late wickets which means England's Zak Crawley has to come out and face seven balls in the gloom, which he survives without getting off the mark.
Matt Milnes does his job as nightwatchman at the other end.
Kent close on 21-2 still 170 runs behind with eight wickets in hand after earlier dismissing Hampshire for 191.
Darren Stevens' 29th first-class career five-wicket haul and six catches from wicketkeeper Ollie Robinson helped do the damage.
Post update
Lancashire 197-6 v Derbyshire
We've still got seven overs left in Liverpool after the delayed start this morning.
George Balderson has been brilliant in defence, notching up 36 from 126 deliveries. He's joined by Danny Lamb who has right from 27.
Remember, Derbyshire need to win this game to give themselves the best chance of making the final.
Close of play at Chelmsford
Essex 108-5 v Middlesex 138
Stumps on an eventful first day between Essex and Middlesex.
Essex close 30 runs behind the visitors with five wickets in hand after 15 in total fell in the day.
Ryan ten Doeschate (28 not out) and Adam Wheater (18 not out) will resume in the morning as the South Group leaders eye some batting bonus points.
Close of play at New Road
Worcestershire 14-0 v Somerset 251
Craig Overton can't nab a late wicket and Jake Libby and Daryl Mitchell survive until the close.
A big day two for both sides tomorrow then with the winner of this tie topping the central group.
And another wicket for Hampshire!
Kent 20-2 v Hampshire 191
Two wickets in the space of two overs for Hampshire at Canterbury.
Daniel Bell-Drummond is comprehensively bowled by Ian Holland for 16 to leave Kent on 20-2.
WICKET
Cox c Alsop b Currie 2 (Kent 20-1 v Hampshire 191)
Hampshire pick up a wicket late in the day at Canterbury.
Kent opener Jordan Cox departs for just two as he edges Scott Currie to Tom Alsop at second slip.
Matt Milnes strides out as nightwatchman for the hosts.
100 for Tom Haines
Surrey v Sussex 217-2
We've not mentioned much of what's happening at The Oval today with neither side able to qualify for the final.
But young Sussex opener Tom Haines has plenty of reasons for a mention as he brings up a century from 186 balls, which has included 13 fours.
He and Delray Rawlins (58 not out) have added 108 for the third wicket so far.
Close of play at Headingley
Yorkshire 36-2 v Leicestershire 124
All done for the day in Leeds after rain unfortunately meant no more play was possible after 16:00 BST.
Yorkshire will hope to resume in the morning without any further delay on 36-2, still 88 runs behind Leicestershire's 124.
Ben Coad took the plaudits earlier in the day with his 5-18 with the ball.
Post update
Worcestershire 5-0 v Somerset 251
Daryl Mitchell and Jake Libby come to the crease at New Road with just four overs left before stumps.
Can Somerset grab a late, late wicket?
Watchful start by Kent
Kent 14-0 v Hampshire 191
Daniel Bell-Drummond (10 not out) and Jordan Cox (2 not out) have made a patient start to Kent's reply so far as we move towards the close of the first day.
Ian Holland and Brad Wheal testing them both out with the new ball so far.
Post update
We're now into the closing stages of day one in the Bob Willis Trophy.
We could have some crucial wickets in the last few overs...