Defending champions Surrey draw with Essex after being set 273 to win.
Chris Rushworth has match figures of 10-76 as Warwickshire beat Hampshire
Notts hang on for draw with Lancashire with one wicket left.
Sam Whiteman scores unbeaten 130 as Northants draw with Somerset
Jonny Bairstow out for nought for Yorkshire against Glamorgan, Adam Lyth hits 174
Ollie Robinson takes 7-48 - and 14 wickets in the game - but Sussex draw at Worcester
Leicestershire extend their unbeaten record with draw at Derby.
Yorks 383-8 - target 492
Jordan Thompson plays out a maiden from Timm van der Gugten, and there are now five overs left at Headingley.
Mickey Edwards and Thompson are resisting Glamorgan, for now...
Derbys 350-7 dec v Leics 122 & 281
A little bit of turn does for Josh Hull as Mark Watt finishes with 3-35 and Chris Wright is left on 49 not out.
Leicestershire lead by 53 and Derbyshire have three overs to chase it down.
Essex 314 & 198 v Surrey 240 & 139-7
Jamie Smith turns Doug Bracewell away for four and another over ticks by at Chelmsford. There are six left and Smith is 37 not out.
Notts 136-8 (target 295) v Lancs
Lancashire have drawn all three of their games so far this season - is this going to be number four?
They've got two overs left to secure a positive result. Stuart Broad and Luke Fletcher have just played out two maidens and it's almost last chance saloon for the Red Rose.
Derbys 350-7 dec v Leics 122 & 281-9
Zak Chappell drops short and Chris Wright square cuts for four to move to 49 not out. He has now faced 112 balls in an excellent rearguard innings for his side.
They lead by 53 - four overs left in the match.
Essex 314 & 198 v Surrey 240 & 135-7
Simon Harmer appeals but the umpire says no and Jordan Clark gets off strike with a leg bye.
The final ball pops up from bat and pad but flies into a gap and Jamie Smith takes one to keep the strike.
Seven overs left.
Notts 136-8 (target 295) v Lancs
This is textbook defensive batting by Stuart Broad, who is doing his best to protect partner Luke Fletcher.
Broad played out five balls from Tom Hartley and then squirted a single through the knot of close fielders to ensure he retains the strike against Jimmy Anderson.
Four overs left.
Essex 314 & 198 v Surrey 240 & 133-7
Lovely straight drive by Jamie Smith brings him four runs off Doug Bracewell. He is 32 not out and Essex have eight overs to bowl with three wickets needed.
Yorks 377-8 - target 492
Two in the over!
Matt Fisher is pinned bang in front from just his fourth delivery, and the umpire's finger flies up.
It's a pair for Fisher, and Mickey Edwards faces a long eight overs of batting alongside Jordan Thompson.
Essex 314 & 198 v Surrey 240 & 128-7
Doug Bracewell strikes with a low full toss as Cameron Steel departs.
Such is Surrey's depth, however, it is Jordan Clark who strides out at number nine.
Four balls and eight more overs left in this one.
Derbys 350-7 dec v Leics 122 & 275-9
Derbyshire need this final wicket and they need it now.
Josh Hull keeps Henry Brookes at bay and there are just seen overs to go.
Essex 314 & 198 v Surrey 240 & 128-6
Jamie Smith showing bags of character here for Surrey. He plays out another Simon Harmer over and has 28 from 92 balls. Nine left and Essex are running out of time.
Yorks 377-7 - target 492
Saud Shakeel goes, and Glamorgan believe!
A thick edge is safely pouched by Marnus Labuschagne at second slip, and Matt Fisher rather slowly heads out to the middle to join Jordan Thompson.
Yorkshire still have 8.4 overs to navigate.
Notts 131-8 (target 295) v Lancs
Make that eight fielders around the bat now.
Stuart Broad is holding firm for Nottinghamshire against Tom Hartley's left-arm spin, although there was a scare when his defensive prod almost rolled back onto the stumps.
Six overs to go...
Essex 314 & 198 v Surrey 240 & 128-6
Was that a chance? It it was, it was a very sharp one to Nick Browne at short leg. He can't take it and Cameron Steel survives. Ten overs to come after this one.
Notts 125-8 (target 295) v Lancs
If anyone can... Jimmy Anderson can!
The veteran seamer sends down an absolute beauty that knocks out Brett Hutton's middle peg.
Great effort with the bat by Hutton, but will it be in vain for Notts? Still 7.5 overs left...
Derbys 350-7 dec v Leics 122 & 275-9
Another twist at the Incora County Ground as Michael Finan is bowled by Henry Brookes.
It looked like he was trying to dab that down to third man but it was right on target and that is a bad error of judgment.
Number 11 Josh Hull arrives with Leicestershire 47 in front. If they get the final wicket quickly, there is still time for Derbyshire.
Notts 125-7 (target 295) v Lancs
Six Lancashire fielders around the bat as Stuart Broad faces the left-arm spin of Tom Hartley.
They're appealing for everything at this stage, but Broad remains obdurate and Nottinghamshire have eight more overs to survive.
Essex 314 & 198 v Surrey 240 & 122-6
A maiden from Simon Harmer and Tom Westley reverts to pace from the opposite end with Doug Bracewell called up for a final burst.
Cameron Steel is on strike and is discomfited by a short delivery which flies over the keeper from his glove for four.
Yorks 351-6 - target 492
Saud Shakeel drives elegantly down the ground for four, and holds the pose as it races to the fence.
There are 12 overs left at Headingley for Glamorgan to take four wickets, or for Yorkshire to score 141 more runs.
Spoiler, they won't.