|LV= County Championship - Division One, New Road|
|Close, day two: Worcestershire 488, Somerset 198-0|
|Worcs 5pts, Somerset 2pts|
Marcus Trescothick hit his sixth County Championship century of the summer to lead the Somerset fightback on day two of their clash with Worcestershire.
The former England batsman ended the day 106 not out, with Arul Suppiah on 86 as Somerset closed on 198-0.
Trecothick also passed 1,500 first-class runs for the season as he and Suppiah left Worcestershire wicketless.
Earlier, Charl Willoughby took 4-115 as Worcestershire were dismissed for 488, Moeen Ali out for a career-best 158.
Worcestershire had resumed on 367-3 but lost Alexei Kervezee to Willoughby's fifth ball before Somerset made continued inroads.
Jack Manuel edged Alfonso Thomas to first slip, before Willoughby had Moeen caught at short cover off a leading edge, but not before he had beaten his previous best of 153, made against Yorkshire at Headingley in 2009.
Willoughby then removed Gareth Andrew and Saeed Ajmal in successive balls to leave Worcestershire 418-8 before a stand of 70 between Ben Scott and Jack Shantry steadied the ship.
But, despite the scoreboard pressure, Worcestershire had no answer to Trescothick and Suppiah as they batted together for 60 overs before the close.
Trescothick swept Ajmal for a single to reach his 49th first-class century, which included 17 fours, and soon afterwards he became the first man to 1,500 first-class runs this summer - more than 400 ahead of his nearest rivals.
CLOSE OF PLAY SUMMARY
BBC Hereford and Worcester's Trevor Owens:
"If Worcestershire had the better of the first day, which they certainly did as they resumed day two on 367-3, then day two was all about Somerset.
"Charl Willoughby picked up four wickets as Somerset hit back well to bowl out the home side for 488, although Moeen Ali made a career-best 158 for the home side, while Ben Scott and Jack Shantry offered resistance down the order.
"But Marcus Trescothick and Arul Suppiah made batting look easy as they gave Somerset just the kind of platform they would have been looking for in their reply.
"Worcestershire will need quick wickets on day three if they are to give themselves anything like a healthy first-innings lead."