Paul Horton's first LV= County Championship century in more than two years steered champions Lancashire to a face-saving draw at Edgbaston which took Warwickshire back to the top of the Division One table.
Horton batted through a rain-shortened final day for his 137 not out to save Lancashire from their fourth defeat in six matches.
Horton and Gareth Cross (75 not out) shared an unbroken sixth-wicket stand of 139 to take Lancashire to 343 for five in their second innings when the sides shook hands on the draw.
Surrey ultimately decided to bat out for a draw in an entertaining match against Somerset.
Set 305 to win from 85 overs, after bowling out Somerset for 180 at the start of the day, Surrey reached a promising 96 for one before a mid-afternoon collapse to 148 for six scuppered their realistic hopes of reaching that target.
However, an unbeaten 70 from Rory Hamilton-Brown had helped steer Surrey to 239 for seven when a draw was settled upon.
A half-century by Michael Klinger helped Worcestershire to a draw after rain on the final morning spoiled a hard-fought match with Sussex at New Road.
The visitors tried to make up for the lost time with a century for Ed Joyce and a knock of 98 by Chris Nash before a declaration at 258 for four left Worcestershire chasing a target of 315 in 60 overs.
And they made sure of their fourth draw in six games, reaching 174 for four before time was called with a dozen overs still to be bowled.
In Division Two, Yorkshire's rain-hit match against Hampshire at Headingley ended in the draw which had seemed inevitable after the first 90 minutes of the final day were lost to light drizzle.
When play was able to resume, 24 of the day's ration of 96 overs had been lost and the only chance of a positive result lay in Yorkshire picking up a cluster of wickets in quick time.
It did not happen as Hampshire's second-wicket pair of Jimmy Adams and Michael Carberry dug their heels in and the visitors went on to reach 191 for two, with an overall lead of 219, before declaring to end the match.
Kent's encounter with Northamptonshire also petered out into a dull draw.
The floodlights were on in gloomy Canterbury when the skippers shook hands with Kent on 112 for one following an uninspiring pursuit of their victory target of 262 from a minimum of 60 overs.
Home captain Rob Key was unbeaten with 55 while Ben Harmison kept him company for two hours, limping to 27 not out.
The weather was also the winner as Leicestershire's game against Essex at Grace Road ended in a draw.
Essex were set a victory target of 270 in 60 overs, but umpires Peter Willey and Jeremy Lloyds abandoned the game at 3.45pm with Essex on 30 for two.