Stand-in Warwickshire captain Ian Bell gave his side hope of pulling off an unlikely victory over Sussex with his first century of the county season on day two at Edgbaston.
After being dismissed for just 87 on the opening day and then dismissing Sussex for 229, Warwickshire fought back through Bell's eye-catching unbeaten 144 to finish the day on 387-7, leading by 245.
Bell, who made a duck in the first innings, bounced back in the second, striking 14 fours and one six after England team-mate Jonathan Trott had departed on the pull to Chris Jordan for 26.
At 95-4 Warwickshire looked in huge trouble, but Bell shared a 132-run partnership with Rikki Clarke (79) for the sixth wicket and then enjoyed a lively unbroken stand with Jeetan Patel (47no) before the close.
At Lord's, Sam Robson pressed home his England claims with an unbeaten century of his own to leave Middlesex well-placed in their Division One fixture with Nottinghamshire.
Robson, after failing twice at Sussex the previous week, returned to form with 144 not out to help Middlesex reach stumps on 296-4 in reply to Notts' 326 all out.
Australia-born right-hander Robson combined with Eoin Morgan to put on 203 runs for the third wicket, keeping a Notts attack which included Peter Siddle (0-70) at bay for large parts of the day.
Steven Finn (5-91) had earlier helped polish off the Nottinghamshire tail to register back-to-back five-wicket hauls at the start of the summer.
Yorkshire posted 450 all out and then snared three Somerset wickets to tighten their grip on their tussle at Taunton.
Adil Rashid moved on from his overnight 84no to reach three figures and Andrew Hodd added 55 before Liam Plunkett (2-48) removed Nick Compton (32) and Chris Jones (75) to put the Tykes on top at the close of play.
Defending champions Durham endured a frustrating second day as Northamptonshire made an assured start to their first-innings, reaching 200-3 in reply to 452.
Stephen Peters (51) and Kyle Coetzer (53) both posted half-centuries to defy Graham Onions (1-62) and co, but Durham remain on the front foot thanks to the efforts of Phil Mustard (91), Gareth Breese (62) and Jamie Harrison (65) at the start of the day.