The stand is also the fourth-highest Test partnership against Pakistan for any country. It was also the first triple-century partnership by a Kiwi pair against Pakistan in the longest format of the game.
Interestingly, Williamson broke his own record which he had stitched with BJ Watling against Sri Lanka in 2015 with a 365-run partnership.
Henry Nicholls falls for 157!Pakistan have broken a stunning 369-run partnership between Nicholls and Kane Willia… https://t.co/0bYONT1wia
— ICC (@ICC) 1609809417000
Andrew Jones and Martin Crowe‘s 467-run stand for the third wicket against Sri Lanka in 1991 is still the highest partnership for a New Zealand pair. Williamson also became the fastest New Zealand batsman to register 7,000 runs in the longest format of the game.
New Zealand batsman Ross Taylor, who has scored the most runs for the Blackcaps in Test, had reached the landmark of 7,000 runs in 96 matches.
Williamson, on the other hand, took just 83 games and surpassed former New Zealand skipper Stephen Fleming and Taylor to become the fastest Kiwi batsman to reach the 7,000-run milestone.
Fleming scored 7,172 runs for the Black Caps in 111 Tests while Taylor has scored 7,379 in 105 games respectively.
Williamson also hit a double ton on day three to give New Zealand firm control in the second Test.
Williamson played an innings of 238 as New Zealand declared on 659/6 — a lead of 362 runs. Along with Williamson, Nicholls and Daryl Mitchell also played knocks of 157 and 102* respectively.
Pakistan had to bat out 11 overs before stumps and with Kyle Jamieson sending back Shan Masood (0) to the pavilion, the visitors ended the day on 8/1 — trailing New Zealand by 354 runs.