Overall, New Zealand is the seventh side in the world to hold the number one spot. It came close to reaching the summit in the last couple of years but stayed second on the table.
Kiwis now have 118 points, two more than Australia and four clear of third-placed India.
England (106) and South Africa (96) complete the top-five.
Williamson consolidated his top spot in the batting list. He had recently leapfrogged India captain Virat Kohli and Australian star Steve Smith with three centuries, including two double centuries, in his last six innings.
They are still third with 70 (PCT) percentage points but are narrowing the gap with Australia (76.7) and India (72.2).
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