Jack Brooks claims four as Yorkshire edge opening day at Trent Bridge

Both dressing rooms boasted a slew of past and present internationals but it was two men for whom Division One of the Specsavers County Championship is the likely pinnacle, who made the significant contributions.

Mullaney top-scored with a tidy 78, outshining England opener Alex Hales among others, and Brooks bounced back from a modest start to take four for 74 as the hosts were dismissed for 261.

That gave the defending champions an advantage on what looked a decent batting pitch, but bad light in the evening meant their reply never got under way.

Middlesex captain Adam Voges suffered a suspected concussion at the Rose Bowl after being hit on the head by a throw while in the field against Hampshire.

Voges was helped from the field by both physios after the incident and will take no further part in the match.

Hampshire made 315 for seven after being invited to bat first, opener Michael Carberry hitting 107 and Liam Dawson an unbeaten 87

Surrey piled on the runs against Durham at the Oval, Arun Harinath leading the charge with 96 as the Brown Caps posted 371 for seven.

Steven Davies added 87 for the home side while Jason Roy, batting at number five, made 64.

England all-rounder Ben Stokes struck early and late, accounting for Rory Burns and Zafar Ansari.

At Taunton Lancashire elected to toss and made the most of batting first, reaching 295 for four by stumps.

There were contributions from all of the top six, with former Somerset batsman Alviro Petersen top-scoring with 83 and captain Steven Croft unbeaten on 71 at the close.

In Division Two England captain Alastair Cook continued his profitable start to the domestic season, reaching 53 not out for Essex against Worcestershire.

Having already scored two hundreds and a half-century he was only stalled by bad light on a day that allowed for only 40 overs.

Essex will resume on 144 for one, Tom Westley unbeaten on 70.

Leicestershire bowled Sussex out for 163 at Hove, Ben Raine taking four for 30 and Wayne White three for 25.

The Foxes responded with 140 for two, Paul Horton ending the day unbeaten on 71.

Mitch Claydon picked up four for 59 as Kent dismissed Glamorgan for 260 at Canterbury.

The Welshmen lasted only 64.5 overs, with home openers Daniel Bell-Drummond (62) and Tom Latham (48) helping their side to 124 without loss in reply.

Derbyshire and Northamptonshire were evenly matched at the County Ground, with Shiv Thakor's 60no shepherding the visitors to 275 for eight.

  Yorkshire's Jack Brooks took four wickets against Nottinghamshire
Yorkshire's Jack Brooks took four wickets against Nottinghamshire