LV= COUNTY CHAMPIONSHIP DIVISION ONE, Headingley:
CLOSE OF PLAY, DAY ONE: Somerset 272 Yorkshire 16-1
(Yorks 3 pts, Somerset 2 pts)
Trescothick hit a ton in his first match since being appointed captain
Marcus Trescothick hit a century but could not stop Somerset being bowled out for 272 on day one against Yorkshire at Headingley.
Trescothick hit 15 fours in his 117, but only found support from Peter Trego (45) and James Hildreth (30).
Tim Bresnan picked up 3-48, with fellow seamer Oliver Hannon-Dalby taking 2-54 on his home debut as the Tykes ran through the Somerset middle order.
The hosts lost opener Adam Lyth for a duck in reaching 16-1 at the close.
In his first Championship game since being appointed captain, Trescothick elected to bat on a chilly, overcast day.
He saw opening partner Arul Suppiah caught behind off Ajmal Shahzad in the day's fifth over. And Hannon-Dalby, who claimed a five-wicket haul against Warwickshire last week, then trapped Nick Compton leg before for just six.
But Trescothick and Hildreth shared a third-wicket stand of 86, taking the score to 121-3 either side of lunch, before a fine spell from Bresnan tipped the game in Yorkshire's favour.
The England paceman trapped Hildreth lbw and quickly followed that up by having Zander de Bruyn caught at gully and dismissing Craig Kieswetter leg before to leave Somerset reeling at 139-5.
Trego arrived to steady the ship with Trescothick, who drove Adil Rashid (2-41) down the ground to reach his century in 160 balls, only for the leg-spinner to return and gain his revenge by trapping the former England international lbw.
Trescothick's dismissal was the signal for Somerset to lose their last five wickets for 66, but Charl Willoughby provided the Cidermen some cheer when he removed Lyth with the sixth lbw decision of the day.
There was still time for Trego to drop Joe Sayers at third slip off the bowling of Damien Wright before bad light forced an early finish.