Derbyshire failed to save the follow-on against Worcestershire at New Road, even though they recovered from 84 for 5 to finish on 223, with contributions from Matthew Cassar, who was unbeaten on 76, and the wicketkeeper Karl Krikken. The damage had already been done by Worcestershire, with Philip Weston, 188 and David Leatherdale, 93, allowing Tom Moody to declare on 554 for 8.
Durham have cause for concern on their second-innings score of 132 for 7 against Somerset at Chester-le-Street, where Mushtaq Ahmed and Andrew Caddick have both taken three wickets so far. The northerners lead by 145, after their pace attack ran through the visitors, reducing them from 75 for 1 at the start to 217 all out.
Four wickets each for the leg-spinner Amer Khan and the seamer James Kirtley set up a rare good day for Sussex against Hampshire at Southampton. Hampshire lost their last eight wickets for 49. Sussex still had a first- innings deficit of 131 but finished the day in front on 201 for 3, thanks to a determined 81 not out from Toby Peirce.
Jonathan Dakin's knock of 135 not out put Leicestershire in control against Northampton at the County Ground, taking them to 380 for 6 at the close. Northamptonshire were earlier bowled out for 332, with James Ormond taking three wickets to finish with 6 for 68.