Williamson's record tracks back to the second ODI against England at the Oval in June, after which he's scored 538 runs at an average of 89.67 and strike rate of 98. He might as well be headed to the crease in a suit holding a briefcase, such is his businesslike nature.
"My focus is to go out, play the situation and contribute to a team performance," he said after captaining New Zealand to a 2-1 overall victory over Zimbabwe yesterday and winning man-of-the-series. "If that means playing some shots when I get close to a hundred, so be it. I won't lose sleep over it."
Anyone who's had even the vaguest of dealings with Williamson will vouch for the sincerity of those comments. The statistics, while pleasant to pore over in almanacks, are of little meaning to him without victories. He is making a difference, too.
In 79 completed ODIs since his 2010 debut, New Zealand have won 40 (51 per cent). Across their history, the national side have won 303 in 653 (46 per cent). Williamson's average of 48.79 ranks eighth among ODI cricketers from test-playing nations to play 20 or more innings.
Further evidence Williamson's 90s are more a by-product of team strategy than a case of anxious yips comes with a comparison to his test game. In 75 innings, he has been dismissed in the 90s just once — 91 against England at Eden Park in March 2013 — and only twice more between 70 and 100.
At this stage, the Williamson 'nervous 90s' hypothesis still appears more fallacy than fact.