Williamson's record ton and NZ's longest unbeaten streak at home
11 Test victories for New Zealand under Brendon McCullum's captaincy - joint second-highest behind Stephen Fleming's 28 wins in 80 Tests. McCullum has 11 victories in 29 Tests and Geoff Howarth also had 11 wins, in 30 Tests. Since McCullum took charge of New Zealand in 2013, only Michael Clarke and Alastair Cook have won more Tests as captain - 13 each in 27 and 35 attempts respectively.
13 Number of consecutive home Tests without a defeat for New Zealand. Their last loss at home was against South Africa, by nine wickets in Hamilton in 2012. Since then they have won seven Tests and drawn six. With this match they also equal their previous longest streak of 13 Tests without defeat at home from March 1987 to March 1991; they had won three and drawn 10 in that sequence.
5 Test centuries by Williamson in 2015 - joint-highest with Steven Smith. Williamson averages 90.15 in Tests this year aggregating 1172 runs in 16 innings. His average is the best among all 500-plus run-scorers this year. His tally is the highest by a New Zealand batsman in a year, going past McCullum's 1164 runs in same number of innings last year. Including Williamson this year, there have been only eight instances when batsmen scoring 1000-plus runs in a calendar year have averaged 90 or more. The last such batsman was Michael Clarke, who made 1595 runs in 2012 at 106.33.
1 New Zealand batsman who have scored more Test centuries than Kane Williamson's 13 - Martin Crowe has 17. Williamson is tied with his team-mate Ross Taylor who also has 13 centuries. Williamson took 85 innings to score these centuries; Crowe took 91 and Taylor 120. Since Williamson's debut, he has scored most centuries for New Zealand in Tests; the next best is eight by Taylor. Among players from all teams, 13 centuries are the joint third-highest since Williamson's debut.
1 Previous instances of New Zealand winning four or more successive Tests at home. They had won five consecutive matches from March 1997 to December 1998 which included one abandoned Test in between. In the present sequence, they have won four in a row - all against Sri Lanka.
12 Whitewashes by New Zealand in Tests, including this 2-0 win. The last such series and their first two were also against Sri Lanka. Nine of those have been at home while all three away in either Bangladesh or Zimbabwe. All the whitewashes for New Zealand have been in two-match series. In fact, they have never won more than two Tests in any series.
7 Tests lost by Sri Lanka this year - most in any calendar year for them. Their previous worst was five losses in four different years - 1994, 2001, 2004 and 2012. They played 11 Tests in 2015 - won four and drew none. In fact, in the last two years they had lost only four Tests out of 15. Also, 2008 was the last time they didn't draw a single Test in a calendar year. Overall, this was their 14th consecutive Test producing either a win or loss. Their longest such streak, without a draw, was from January 2001 to March 2002 - 16 Tests; when they won 11 and lost five.
0 Teams that have lost more Tests in 2015 than Sri Lanka; West Indies are the other team to lose seven Tests this year. However, West Indies have one more Test to play, the Boxing Day Test in Melbourne. Sri Lanka, who have the most losses this year, had the most wins last year.
2012 The last time a New Zealand batsman scored a century in the fourth innings of a Test. That was against South Africa in Wellington, also by Williamson. He had made an unbeaten 102 to secure a draw for New Zealand who were chasing 389. Apart from Williamson, only one other New Zealand batsman has made hundreds in the fourth innings of Tests more than once: Bev Congdon, who also made two such scores.
3 Man-of-the-Match awards for Williamson in Tests, including the one in this match. In all the three Tests when he has won the award, he has made second-innings hundreds: 161* against West Indies in Bridgetown (2014), 242* against Sri Lanka in Wellington (2015) and 108* in this Test. Three of his four second-innings centuries have won him such awards.
91.88 Williamson's average against Sri Lanka in Tests. He has scored 827 runs in 12 innings with three centuries and four half-centuries. His average is the second-highest among batsmen who have accumulated over 500 runs against Sri Lanka. The highest is 110.44 by Michael Hussey.
26.93 Sri Lanka's runs per wicket in Tests this year - the worst in a calendar year for them playing 10 or more Tests. Their previous worst was 28.44 in 2002, in 10 Tests.
Bharath Seervi is stats sub-editor at ESPNcricinfo. @SeerviBharath