Kane Williamson’s fifth century of the year has earned him an early present from Santa – he’s now the number one-ranked Test batsman in the world.

The 25-year-old cracked an unbeaten 108 to guide New Zealand to a five-wicket win in the second Test against Sri Lanka in Hamilton – the 13th Test ton of his career.

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He also took his 2015 runs aggregate to 1172 to surpass skipper Brendon McCullum’s record for most Tests runs by a New Zealander in a calendar, year set in 2014.

This is the first time Williamson has held the top spot in the ICC rankings, dislodging England’s Joe Root.

Australian Steve Smith and South African AB de Villiers have also occupied the number one spot this year.

Australian vice-captain David Warner is in fifth place.