UPDATE 2-Cricket-Sri Lanka race to series win against Pakistan

* Sri Lanka win second test by seven wickets

* Nine Pakistan wickets fall for 35 runs

* First home series win for Sri Lanka over Pakistan

(updates at end of test)

COLOMBO, July 14 (Reuters) - Sri Lanka romped to a seven-wicket victory over Pakistan to win the series after the visitors suffered a dramatic batting collapse on the third day of the second test on Tuesday.

Sri Lanka raced to their 171-run victory target in 31.5 overs during the afternoon with opener Malinda Warnapura scoring a brisk 54, Kumar Sangakkara an aggressive 46 and Mahela Jayawardene finishing off the game with an undefeated 37.

Having won the first test in Galle by 50 runs, Sri Lanka now have an unassailable 2-0 lead in the three-test series and can celebrate their first series win against Pakistan on home soil.

The run chase had been set up by bowlers Rangana Herath and Nuwan Kulasekara, the pair ripping through the Pakistan order after lunch as nine wickets fell for just 35 runs.

Spinner Herath claimed career-best figures of 5-99 and seamer Kulasekara finished with 4-37 as Pakistan were dismissed for 320.