|LV County Championship Division One, Emirates Durham ICG|
|Close of play, day one: Durham v Warwickshire 345-7|
|Warwicks 3pts, Durham 2pts|
Will Porterfield scored 87 as Warwickshire had the better of the opening day of their match at Durham.
The Irish batsman shared a fourth-wicket partnership of 131 with captain Jim Troughton (76) as the visitors closed on 345-7.
Varun Chopra, who hit double centuries in his first two matches, made 23 and is six short of 500 Championship runs this season.
Ruel Brathwaite took three late wickets to finish with 4-50.
The England-qualified West Indian followed up his five-wicket haul against Sussex on Saturday by taking 3-11 in four overs in the final session, after Warwickshire had threatened to totally dominate the day.
Chopra and Ian Westwood (46) put on 71 for the first wicket, before the latter was caught by Michael Richardson off Callum Thorp.
Warwickshire also lost the wicket of Chopra before lunch, as he became Brathwaite's first victim of the match.
After Graham Onions accounted for Pakistan batsman Mohammad Yousuf (25) after the interval, Porterfield and Troughton excelled, scoring 131 in 31 overs.
Porterfield was trapped lbw by Scott Borthwick to bring in Rikki Clarke, who smashed 49 off 52 balls, including seven fours and two sixes.
Clarke's knock was ended when he pushed forward and edged Brathwaite to Gordon Muchall at first slip and next ball Tim Ambrose edged to the wicketkeeper.
In the penultimate over of the day, Troughton was surprised by extra bounce and gloved to the wicketkeeper to become Brathwaite's fourth victim of the innings.
DAY ONE REACTION
BBC Newcastle's Martin Emmerson:
"Three wickets in three overs from Durham fast bowler Ruel Brathwaite made for more pleasant viewing for the home side when it came to looking at the scoreboard.
"They'd toiled all day on a wicket which offered little. Then when the chances did come they were not taken and William Porterfield was the major beneficiary.
"Dropped on one by stand-in keeper Michael Richardson, he went on to make 87 in a stand of 131 for the fourth-wicket with Jim Troughton.
"But Ruel Brathwaite gave the home team a lever as he struck late on to take three wickets at the close.
"Rikki Clarke and Tim Ambrose went in consecutive balls, followed by Troughton a couple of overs later."
BBC WM's Richard Wilford:
"Warwickshire's new-found confidence with the bat continued on what is not usually a happy hunting ground for them.
"Jim Troughton's first half-century as skipper was a major breakthrough after a tough year in 2010, and it was a well-controlled knock too.
"Will Porterfield had a bit of good fortune but there were some terrific attacking strokes in his 87, responding well to the pressure for places that will come when Bell and Trott are available next week."