Kane Williamson acknowledges the crowd after leading New Zealand to a 2-0 test series sweep against Sri Lanka.

Black Caps' star batsman Kane Williamson has climbed to the top of the world test cricket batting rankings after his record-breaking year.

Williamson jumped two spots to top the International Cricket Council ranking list for the first time after his 108 not out guided New Zealand to a five-wicket victory over Sri Lanka in Hamilton.

On the updated rankings he moved above England's Joe Root (886 points) and South Africa's AB de Villiers (881) to sit on 889 points. Two Australians round out the top-five, with Steve Smith on 874 points and David Warner on 863.

It was the first time since the ICC introduced the rankings system that a New Zealander has been No 1.

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GETTY IMAGES Kane Williamson set a new record for test runs in a calendar year by a New Zealand batsman.

Named man of the match in the Hamilton test against Sri Lanka, Williamson now has career figures of 3895 runs from 46 tests at an average of 49.93.

Earlier on Monday, Williamson broke the record for most runs in a calendar year by a New Zealand batsman.

He brought up the mark when he reached 102 not out to take his tally to 1166 test runs in 2015.

GETTY IMAGES Kane Williamson set a New Zealand record for test runs in a calendar year.

Williamson required another 23 runs this morning to surpass his skipper Brendon McCullum for the most test runs scored for New Zealand in a calendar year. McCullum set the mark of 1164 test runs in 2014.

He did so when bringing up his century as he pushed New Zealand to the brink of a win in the second test and a 2-0 series victory. This year, the 25-year-old has scored a test double century, four other centuries and four half-centuries.