|LV= County Championship Division One, Wantage Road|
|Northants v Somerset 366-8|
Former England batsman Marcus Trescothick scored his fourth century in eight first-class innings as Somerset made 366-8 against Northants.
Trescothick reached 124 and was given excellent support by Peter Trego (77).
Craig Kieswetter was forced to retire hurt with a laceration under his right eye and a suspected broken nose after being hit by a David Willey bouncer.
Willey ended day one at Wantage Road with figures of 3-74 while Olly Stone took 3-95 on a day Somerset edged.
Somerset captain Marcus Trescothick said: "The new ball was tricky with wickets in the morning and tonight.
"I was delighted (with his 124) because it was really tricky this morning and I didn't feel like I was seeing it very well and then I had to work hard."
As for Kieswetter, Trescothick says that the full extent of the damage is yet to be realised.
He added: "He's still being assessed. He'll see people, we're going to pop in and see him in a bit and we'll get to know a bit more after that.
"It wasn't particularly nice and it was a nasty situation when we were out there."