Sri Lanka already lead Bangladesh by 323 runs with five wickets in hand and appear set to post a formidable first innings total in good batting conditions.
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Left-handed Sangakkara, who reached his 13th Test century shortly before lunch by lofting Mohammad Rafique for a six, has so far hit 18 boundaries and two sixes.
Sangakkara was involved in three big stands, adding 128 for the second wicket with Malinda Warnapura, 98 for the third with skipper Mahela Jayawardene and 92 for the fourth with Chamara Silva.
Jayawardene failed to add to his lunch score of 49 when he top-edged a hook off Shahadat Hossain to Shahriar Nafees at square-leg in the second over after the break.
Bangladesh bowlers kept a steady line and length to check the flow of runs, but their good work was undone by sloppy fielding that afforded the Sri Lankan captain