Notts beat Surrey by three wickets
Essex beat Gloucs by 10 wickets
Northants v Sussex & Worcs v Kent abandoned
Draws at Durham v Somerset, Hants v Warwickshire
Warwickshire captain Ian Bell hits 174
Hampshire 202 & 59-2 v Warwickshire 360
Image source, Getty ImagesBoyd Rankin removes young Hampshire opener Tom Alsop to set a few nerves jangling in the home dressing room.
Hampshire still need 99 to avoid an innings defeat.
Quite a few of you have been calling for James Vince to replace James Taylor in England's middle order.
The Hampshire skipper is currently 15 not out.
What's the best County Championship innings you've seen?
Nottinghamshire 446 & 72-1 v Surrey 225 & 389
But now Steven Mullaney is gone, lbw to Ravi Rampaul.
Could be too little too late for Surrey, but you never know - the victory target is 169.
Nottinghamshire 446 & 72-0 v Surrey 225 & 389
Image source, Rex FeaturesSteven Mullaney is taking Nottinghamshire to victory - and quickly.
The opener is 42 not out off 41 balls.
Notts need another 97.
You've just done my job for me Jack. Thanks!
Yorkshire v Leeds Bradford MCCU 225-8 (match drawn)
Leicestershire 254-9 dec & 33-0 v Loughborough MCCU 262-8 dec
Glamorgan 533-7 dec v Cardiff MCCU 66-0
Derbyshire 396-6 v Durham MCCU 242-6
Lancashire 290-7 dec v Cambridge MCCU 75-4
Several counties, not involved in County Championship games, have also been playing this week against the university teams.
County Champions Yorkshire had to settle for a draw in a rain-affected game against Leeds Bradford MCCU having restricted the university side to 225-8.
Jack Brooks and Karl Carver both picked up three wickets each.
Glamorgan declared on 533-7 against Cardiff MCCU, with centuries for David Lloyd and Aneurin Donald, while Lancashire captain Steven Croft hit 103 not out against Cambridge MCCU.
What's the best County Championship innings you've seen?
Shantry scored 100 not out and had match figures of 10-131 in Worcestershire's victory over Surrey in that game. Impressive.
Nottinghamshire 446 & 35-0 v Surrey 225 & 389
Steven Mullaney, who hit 113 in Notts' first innings, is unbeaten on 19.
What's the best County Championship innings you've seen?
Brutal.
Worcestershire v Kent (match drawn)
Unfortunately the game against Kent was abandoned a couple of hours ago without a ball being bowled.
Hampshire 202 & 24-1 v Warwickshire 360
Keith Barker makes the breakthrough for Warwickshire as he tempts Michael Carberry to edge to Varun Chopra at slip.
It's Barker's sixth wicket in the match.
Tweet us using #bbccricket
Image source, Getty ImagesWe've certainly seen some fine batting during the opening round of the 2016 County Championship season.
Ben Duckett's unbeaten 282, Ian Bell's 174 and a century in each innings for Durham opener Keaton Jennings were just some of the highlights.
But what's the best innings you've ever seen in a County Championship match? It doesn't have to be the highest score, maybe the most important innings or exciting.
Get in touch using #bbccricket on Twitter.
Every ball covered
There are only two matches still ongoing, but you can listen to ball-by-ball radio commentary on both games by clicking the live coverage tab at the top of this page.
The BBC has live radio commentary on every County Championship game in 2016.
James Taylor retires because of heart condition
England Test captain Alastair Cook told BBC Essex:
"He proved people wrong time and time again and was a great character to have around the dressing room. Those short leg catches in South Africa, doing the hard work for the team.
"It's a career cut very short but on the flip side at least it's been detected and we're not talking about something a lot worse.
"All our thoughts are with him, his family. Hopefully the operation can go well and we'll see him around, and adding his talent to the English game in a different way."
James Taylor retires because of heart condition
England Test captain Alastair Cook told BBC Essex:
"I think we were just seeing the best of him - he would have played in that first Test match.
"It's a great shock, it's very sad, but if there's a guy that can handle what he's going through, it's him because of his character. That's why he's been such a successful cricketer, he's a very down to earth guy and all are thoughts are with him.
"One of his great strengths was finding a way. First time I came across him here, I don't know if he got 200, but he got a very big hundred playing for Leicestershire against Danish (Kaneria) on a spinning wicket. The way he played spin was fantastic and he found a way."
Image source, Rex FeaturesJames Taylor retires because of heart condition
England Test captain Alastair Cook told BBC Essex:
"When I found out on Monday night it was a huge shock, and a realisation of how lucky we are that we are able to play this great game.
"All our thoughts are obviously with James, I know he's got a big operation this week - hopefully that goes well and he can be one of the lucky ones where this was picked up early enough."
Nottinghamshire 446 v Surrey 225 & 389
First-innings centurion Steven Mullaney and Greg Smith to get the chase under way for Notts.
Who should replace James Taylor in England's middle order?
Ian Bell certainly sparks opinions doesn't he!?
Hampshire 202 & 18-0 v Warwickshire 360 - Lunch
BBC Radio Solent's Kevan James at the Ageas Bowl:
"Chris Woakes didn't take to the field for the 35 minutes that Hampshire batted up to lunch in their second innings. Apparently he has a sore hamstring.
"Hampshire who began their second innings 158 runs in arrears, safely negotiated the 10 overs up to the break.
"The pitch looks easy paced now even with the new ball, and Keith Barker who took five early wickets in Hampshire's first innings isn't getting the same amount of movement this time around."