Williamson registered scores of 49 and 52 not out in New Zealand's WTC final win last week.
Williamson registered scores of 49 and 52 not out in BlackCaps’ eight-wicket win over India in the low-scoring WTC final and he now enjoys a 10-point lead over Steve Smith.
Ross Taylor, who played a knock 47 not out to take the Kiwis over the line, has moved three places to 14th position while left-hander Devon Conway has gained 18 slots to reach 42nd place after top-scoring with 52 in the first innings.
India skipper Virat Kohli retained his fourth position with 812 points. Rohit Sharma has also held on to his sixth spot, while Rishabh Pant has dropped one place to seventh.
New Zealand fast bowlers have also made notable gains with their stellar showing in the WTC final at Southampton.
Kyle Jamieson, who earned the Player-of-the-Match award for his seven wickets in the marquee game, has jumped to a career-best 13th position. Left-arm pacer Trent Boult’s five scalps in the WTC final have lifted him two places to 11th position.
For India, vice-captain Ajinkya Rahane moving up three places to 13th position after scores of 49 and 15 was the only notable gain.
Australia speedster Pat Cummins continues to occupy the No. 1 slot in the bowling rankings. While India off-spinner Ravichandran Ashwin holds the second position, New Zealand's Tim Southee and Neil Wagner are in the third and fifth spots respectively.
Ravindra Jadeja, who had become the numero uno all-rounder in Tests last week, has also lost his crown to West Indies’ Jason Holder. Jadeja has now dropped to the third spot, while England's Ben Stokes occupies second place.
(With ANI inputs)