The West Indies took an unassailable 2-0 lead in the one-day series with Sri Lanka thanks to a seven-wicket win in Port-of-Spain.

Shivnarine Chanderpaul followed up his heroics in the series opener with another unbeaten half century as the hosts reached a revised target of 125.

He put on an unbroken fourth-wicket stand of 107 with Marlon Samuels, the right-hander rewarding the faith of the selectors by blasting three fours and as many sixes in his 54 not out.

Earlier Sri Lanka had slipped from 78-1 to 112-5 before rain curtailed their innings after just 30.3 overs.

They had already been interrupted by bad weather before, a second break in play working against them as they lost three wickets in the space of just 13 balls.

Such a disappointing collapse ruined the good work done by Upul Tharanga after Windies skipper Chris Gayle had won the toss and inserted the tourists under cloudy skies.

The left-hander hit five fours to make 40, firstly putting on 38 with opening partner Mahela Udawatte and then adding a further 40 for the second wicket with Kumar Sangakkara.

However, his departure with the score on 78, caught at third slip by Jerome Taylor off the bowling of Dwayne Bravo, sparked a middle-order collapse.

Gayle's decision to introduce himself into the attack proved a masterstroke when Sangakkara helped a legside full toss straight to short fine leg to depart for 28.

Chamara Silva also found himself outdone by the spinner after Darren Sammy had tempted Kaushalya Weeraratne to drive in the air straight to Bravo at backward point.

The clatter of wickets left the West Indies with a much simpler task under the Duckworth-Lewis system, though they suffered an early slump against the new ball.

Nuwan Kulasekara claimed career-best figures of 3-28, beating his efforts two days earlier of 3-43, to leave the home side in a hole at 18-3.

Bravo's promotion to open the innings failed to come off as he was bowled through the gate for just two, while Gayle managed only 11 before lofting the seamer to mid-on.

Ramnaresh Sarwan soon followed when he was adjudged leg before with only one to his name but once again Chanderpaul came to the rescue, hitting three fours and two sixes to finish on 52 not out.

Samuels proved an able ally in their partnership, the pair appearing to be in a race to see who could get to their 50 first as West Indies wrapped up the series in style with one game still to play.