New Zealand's best batsman has climbed two places in the International Cricket Council's players ratings, released overnight.
Williamson is up to No 5, his highest placing, on the back of his dazzling 140 against Australia last week in the first test defeat at Brisbane.
Just 44 points separate the top seven batsmen - who are rounded out by Sri Lankan allrounder Angelo Mathews and Australian opener David Warner.
The numbers also suggest that Australia skipper Steven Smith (No 2), England's Joe Root (3) and Williamson are about to engage in years of one-upmanship in the rankings chart.
The other two in the top five, South Africans AB de Villiers (1) and Hashim Amla (4) are both over 30, while the other three are between 24 and 26.
Williamson, whose average of 47.19 is the highest of any New Zealand test player with a minimum of 20 innings, earned praise from Australia's coach Darren Lehmann yesterday.
"I think he's one of the best five batters in the world. He's a very, very good player, one of the best I've seen come out of New Zealand," Lehmann said.
"We didn't bowl to him how we would've liked [in Brisbane], or how we planned, so hopefully that changes in the next test."
Smith also spoke highly of his batting rival and was asked if he'd seen any weaknesses.
"I'm not sure, I'd like to know. He's a quality player, he looked good in both innings (140 and 59), his game is together, he looked really tight with really soft hands," Smith said.
New Zealand captain Brendon McCullum stayed at No 15 on the list, but Ross Taylor slipped four spots to No 17, while BJ Watling slid two to No 25.
On the flipside opener Tom Latham climbed two, to No 35, while offspinning allrounder Mark Craig jumped eight spots to No 57.
Both leading New Zealand bowlers, Trent Boult and Tim Southee, slipped one spot to No 6 and 11 respectively. Craig drifted one place to No 40 while Doug Bracewell dropped six to No 47.
South African quick Dale Steyn continues to lead the bowling list, with England's Jimmy Anderson and Pakistan spinner Yasir Shah equal second.
The top five rated batsmen in test cricket:
1: AB de Villiers (South Africa), age 31, tests 99, average 51.92, 21 hundreds
2: Steven Smith (Australia) age 26, tests 34, average 55.15, 11 hundreds
3: Joe Root (England) age 24, 35 tests, average 54.9, 8 hundreds
4: Hashim Amla (South Africa) age 32, tests 85, average 52.0, 23 hundreds
5: Kane Williamson (NZ) age 25, tests 42, average 47.19, 11 hundreds
By David Leggat of the New Zealand Herald in Perth
