|LV County Championship Division One, Taunton|
|Close, day one: Somerset 309 v Worcestershire|
|Somerset 3pts, Worcs 3pts|
Craig Kieswetter scored his first Championship century of the season but Somerset's batsmen struggled on the opening day against Worcestershire.
Kieswetter made 117, including 13 fours and three sixes, and helped the visitors recover from 53-3 at Taunton.
He shared a fourth-wicket partnership of 167 with Nick Compton (57) on an otherwise difficult day for the hosts.
Gareth Andrew took 4-93 as Somerset were bowled out for 309 in the final over before the close.
Captain Marcus Trescothick (31) elected to take first use of a green pitch after winning the toss and the former England opener put on 44 for the first wicket with Arul Suppiah.
Suppiah pushed forward to former team-mate Andrew to edge to Vikram Solanki at first slip and his dismissal sparked a flurry of three wickets in 19 balls.
Trescothick chopped onto his stumps in Andrew's next over and James Hildreth was run out before he faced a ball, answering a poor call from Compton for a single.
Kieswetter and Compton took Somerset to lunch on 92-3 and the pair batted throughout the afternoon session to move the total on to 209-3.
Their 167-run partnership was ended when Damien Wright (2-40) had Compton caught by Solanki in the slips.
Jos Buttler made only five before becoming Solanki's third slip catch and Andrew's third wicket of the afternoon.
After a three-an-a-half-hour 175-ball stay at the crease, Kieswetter gave his wicket away as he played across a full ball and was bowled by Jack Shantry (2-54).
Teenager Lewis Gregory, on his Championship debut, followed to the same bowler for a duck, Gemaal Hussain was lbw to Alan Richardson for three and Steve Kirkby become Wright's second wicket for one.
Peter Trego (53 not out) helped Somerset to a third batting point and put on 25 for the last wicket with Charl Willoughby, who become Andrew's fourth wicket.
CLOSE OF PLAY SUMMARY
BBC Hereford and Worcester's Dave Bradley: "Worcestershire were in the ascendancy early doors, getting rid of Trescothick and Somerset were three down for 53.
"Two sharp chances were put down off Kieswetter and he and the diligent Compton looked set to turn the day Somerset's way.
"Kieswetter, who had battled well for his century, played all round a Shantry yorker, with the left-armer bowling a tight spell.
"Worcestershire fought back and Wright got some reward after having bowled a fine spell post lunch, although Trego once again frustrated the visitors.
"Somerset have reached a par score on a green-tinged pitch."