Div One: Yorkshire on top
Yorkshire's bowlers underpinned their team's position at the top of the division by maintaining a recent stranglehold on Warwickshire in the latest meeting at Edgbaston.
Nine wickets fell to the pace attack and one to 18-year-old spinner Karl Carver as the home side were dismissed for 228, with a solitary half-century for Jeetan Patel from the number nine position.
In the last 13 months Yorkshire have twice chalked up big victories over the midlanders, but it may not be entirely straightforward this time.
In a tricky final session, Alex Lees, unbeaten with 40, and Andrew Gale (31 not out) were fully tested in taking them to 82-2 after a double strike by Chris Woakes in successive overs.
Yorkshire all-rounder Richard Pyrah is looking for the batsmen to build on a "good disciplined performance" by the bowlers.
He said: "It was a good effort to bowl them out. Hopefully we can now get a good score and put pressure on them.
"There's a bit of carry in the pitch - which made a change from Arundel last week - and the ball swung for us."
Nottinghamshire enhanced their title credentials with a ruthless display on the first day of their match against Somerset at Trent Bridge.
Second at the start of the day, the home side bowled Somerset out for only 168 in just 51.2 overs, with all four seam bowlers amongst the wickets.
Notts then responded in style, closing on 208-1, a lead of 40, after openers Phil Jaques and Steven Mullaney had put on 203 for the first wicket.
Mullaney fell just before the close, for 91, but Jaques remained unbeaten on 111 at stumps.
Harry Gurney and Andre Adams each picked up three wickets of the wickets to fall in the Somerset innings, with Peter Siddle and Ajmal Shahzad grabbing two apiece.
The visitors' tally would have been much worse without the contribution of their captain, Marcus Trescothick, who scored 87 from 133 deliveries, hitting 16 fours, although he had been badly put down by Samit Patel on 22.
Mullaney admitted he was pleased with his score of 91 in his effort for the team despite narrowly missing out on a century.
He said: "I don't feel I've been out of form at any time this season but I've just not been getting the scores, so if you'd asked me at the start of the day would I accept 91 and help put on 200 for the first wicket I'd have bitten your hand off.
"We would have batted had we won the toss but Harry Gurney set the tone right at the start of the day with his opening spell.
"Tres played nicely for them but we've put ourselves into a really good position after the first day."
Mark Stoneman struck his third century of the season before lower order runs helped Durham to a decent total on day one of their clash against Sussex.
The left-handed opener struck 16 fours and a six in his 113 but once he fell with the total at 202-7, it appeared Durham would post a sub-par total after winning the toss at Chester-le-Street.
But new man John Hastings contributed a gritty 51 while Paul Coughlin and Chris Rushworth put on 47 for the last wicket to lift the total to 337 all out, with Sussex closing on 20 without loss in reply.
While Steve Magoffin, moving the ball both ways, was comfortably the best Sussex bowler but only claimed one wicket, with Lewis Hatchett taking 5-113.
Stoneman admitted the match started off tough but got easier as the ball bedded in.
He said: "The first 45 minutes were probably the hardest I've had this season. The bowling was very accurate and there wasn't a lot to score off.
"It got easier as the ball started to get softer, but they got it changed straight after lunch and the replacement was harder and bounced more."
Steven Croft and Ashwell Prince both made big centuries as Lancashire's batsmen enjoyed their best day of the season against Northamptonshire at Emirates Old Trafford.
Coming together with their side poorly placed on 33-3 in 14th over, Prince and Croft added 332 for the fourth wicket and put the bowlers to the sword in merciless fashion on the opening day of the clash.
Having batted for two minutes short of five hours, Croft was dismissed seven overs before the close for a career-best 156 but Prince remained undefeated on 161 as Lancashire ended the day on 384-4 and virtually certain to earn a maximum five batting bonus points for the first time this season.
Croft and Prince's partnership was Lancashire's highest in first-class matches against Northamptonshire and the biggest ever fourth-wicket stand at the ground.
It was also the county's third-highest stand at Manchester and Lancashire's biggest partnership for any wicket since 2003.