Somerset's Charl Willoughby and Alfonso Thomas led their side's bowling attack to defeat the First Division leaders Durham by nine wickets at Taunton yesterday.
Durham resumed their second innings on 209 for 1 and looked set to save the game, but Somerset's two pacemen made sure they added only a further 169 runs. Murali Kartik removed the overnight centurion Will Smith for 114, before Willoughby finished with figures of 4 for 80 and Thomas 3 for 63 as Durham were dismissed for 378.
In response, Somerset reached the required target inside 22 overs, finishing on 119 for 1 as Arul Suppiah ended unbeaten on 66, keeping their title hopes alive.
On Saturday, First Division title chasers Lancashire beat Yorkshire by 23 runs in one of the most thrilling Roses matches at Headingley.
Yorkshire needed a further 148 to win as they resumed on 136 for 6 overnight. Although Adil Rashid and Ajmal Shahzad put on 43 for the ninth wicket, Kyle Hogg dismissed Shahzad before Gary Keedy trapped Rich Pyrah leg before as Yorkshire were out for 260.