COLOMBO: Sri Lankan captain Kumar Sangakkara hit 109 as the hosts took a huge 470-run lead over New Zealand by lunch on the fourth day of the second and final Test here on Saturday.

Former captain Mahela Jayawardene was unbeaten on 90 as Sri Lanka moved to 288-3 in their second innings and were poised for an early declaration after lunch.

The hosts, who resumed at the overnight score of 157-2, added 131 runs in the morning session on a slow wicket that appeared to offer little assistance to the bowlers.

Sri Lanka won the first Test in Galle by 202 runs last week and a 2-0 sweep of the series will make them number two in the official Test rankings behind South Africa.

The hosts currently share the second spot with India.

Sangakkara's 20th Test century was his third this year and the sixth at his favourite hunting ground, the Sinhalese Sports Club.

He put on 173 for the third wicket with Jayawardene before being caught in the slips by Ross Taylor off Jeetan Patel.

The left-hander hit 12 boundaries and a six during his four-hour stay at the crease.

First-innings century-maker Thilan Samaraweera kept Jayawardene company at lunch on 15.