Durham, who lead Division One and are hoping to press home their advantage with a win over Derbyshire, only made one breakthrough on the opening morning.
Visiting skipper Paul Collingwood won the toss and chose to field, but his side could only claim the wicket of Ben Slater for 13, as Paul Borrington (30 not out) and captain Wayne Madsen (28no) steered Derbyshire to 95 for one at lunch.
Yorkshire, who are just behind Durham in the race to be crowned county champions, enjoyed a good start against Sussex at Hove.
The Tykes won the toss and elected to field, which proved to be an excellent decision as the hosts went into lunch 117 for five.
Liam Plunkett (two for 20) was the pick of the bowlers, with Chris Nash (35) the top-scorer for Sussex, as Matt Prior and Ben Brown got to lunch with an already imposing task of building a good target ahead of them.
Nottinghamshire were 73 for one against Middlesex at Lord's.
Chris Rogers won the toss and put Notts in to bat, with Neil Dexter claiming the only wicket of the first session when he dismissed Riki Wessels for 14. Steven Mullaney was 40 not out with Michael Lumb also at the crease.
Surrey's decision to bat first seemed to have backfired as they were rocking on 61 for four at lunch versus Somerset.
Craig Meschede (two for 13) claimed the wickets of Dominic Sibley (10) and Hashim Amla for a five-ball duck, with Rory Burns (21) and Vikram Solanki (14) also sent back to the pavilion.
In Division Two, Essex were 52 for two against Kent.
Jaik Mickleburgh was dismissed for a duck in the first over of the day by Mark Davies, with Greg Smith (15) the other man to fall on the opening morning.
Lancashire started strongly against Leicestershire as they were 92 without loss, with Paul Horton (42no) and Luis Reece (31no) standing firm.
Elsewhere, Hampshire recovered after losing the wicket of captain Jimmy Adams (nought) in the first over to move to 105 for two.
Liam Dawson (43no) and James Vince (45no) steadied the ship after Alan Richardson accounted for Adams and Michael Roberts (13) in the first session.