Impressive half-centuries from Tillakaratne Dilshan and Thilan Samaraweera helped put Sri Lanka firmly in control against Bangladesh on day three of the second Test in Chittagong.
The pair enjoyed an unbeaten fifth-wicket stand of 131 as the tourists reached 4-296 at stumps to take a commanding lead of 472.
Kumar Sangakkara also posted a patient 54 earlier in the day and Sri Lanka will now be confident of claiming a series whitewash after winning the opening Test by 107 runs in Dhaka last week.
Having bowled out the home side for 208 on Sunday, the tourists resumed day three on 0-13 in their second innings.
Prasanna Jayawardene and Malinda Warnapura took the total to 55 before both lost their wickets in the space of three deliveries.
Jayawardene went for 28 when he chipped a Mohammad Ashraful delivery to short midwicket, where Shakib Al Hasan dived forward to take a fairly easy catch.
Warnapura then joined him in the pavilion at the start of the next over when he was trapped lbw by Shahadat Hossain for 27.
Sangakkara and skipper Mahela Jayawardene took their time to get going as they safely negotiated the remaining overs before lunch to take the tourists on to 2-95 at the interval.
The duo continued to stretch Sri Lanka's lead at the start of the middle session, building a third-wicket stand of 68 before Enamul Haque Jr broke the partnership with the dismissal of Mahela Jayawardene for 22 - Imrul Kayes taking the catch at short cover.
Sangakkara kept things going at the other end and passed his 28th Test fifty with a boundary off Haque Jr.
But he fell just four overs later when a delivery from Ashraful found its way onto his stumps.
Samaraweera and first-innings centurion Dilshan then saw Sri Lanka through to tea before settling in for the duration of the final session.
Dilshan, in particular, appeared in a hurry to get runs on the board while Samaraweera showed more patience at the other end and seemed content to let his partner do the hard work.
Samaraweera was the first to bring up his fifty in the 75th over but Dilshan, who had rescued Sri Lanka with a stunning 162 in the opening innings, quickly followed with his half-century coming off just 70 balls.
Haque Jr and Hossain felt the full force of the partnership, conceding over 60 runs each, as the batsmen marched on towards the close of play.
Dilshan had reached 81 at stumps with Samaraweera on 72 to leave Bangladesh needing a small miracle if it is to claim something from the Test.