Stats - Williamson and Nicholls, at their best when together in Test cricket
Both of them scored double-centuries at Basin Reserve on Saturday, becoming just the eighth pair with two 300-plus partnerships in Test cricket
1 - Kane Williamson and Henry Nicholls became the first pair to score double-centuries in the same Test match for New Zealand. They are now the 18th pair overall to score double-hundreds in the same Test innings. This is also the first instance of two batters scoring double-centuries in the same first-class innings in New Zealand.
8 - Number of batting pairs with two 300-plus partnerships in Test cricket, including Williamson and Nicholls.
They are also the first New Zealand pair with multiple triple-century stands. Their first such partnership came in 2021 when they added 369 runs for the fourth wicket against Pakistan in Christchurch.
363 - Partnership runs between Williamson and Nicholls, the fifth-highest for any wicket for New Zealand in Tests. Three of New Zealand's top-five partnerships in Test cricket have come against Sri Lanka.
Similarly, three of the top-five Test partnerships against Sri Lanka have been by New Zealand - the 363 between Williamson and Nicholls is the fourth-highest.
8124 - Runs for Williamson in Test cricket, the first player from New Zealand to complete 8000 Test runs. His current batting average of 54.89 is the fifth-highest among the 35 batters with 8000-plus runs in Test cricket.
41 - Hundreds for Williamson across formats in international cricket, the most by any player for New Zealand. Williamson surpassed Ross Taylor's 40 centuries with his innings of 215 in Wellington.
5 - Test double-centuries for Williamson at home. Only Don Bradman (7), Virat Kohli (6) and Kumar Sangakkara (6) have more in home Tests than Williamson, while Ricky Ponting also has five.
9 - Out of 15 Test double-centuries scored at Basin Reserve, nine have come since 2014. No other venue had more than four individual double-centuries in Test cricket in this period.
The 15 double-centuries in Wellington are also the joint-fourth-highest at a ground in Tests.
Sampath Bandarupalli is a statistician at ESPNcricinfo