Krejcikova's run to her second grand slam singles title, capped by a 6-2 2-6 6-4 victory over Paolini in the final on Saturday (local time), allowed her to jump 22 places to No.10 in the world.
The 28-year-old from the Czech Republic had last been that high in the rankings the week of January 8. She has reached a high of No.2 in singles and No.1 in doubles.
Paolini moved up from No.7 by becoming the first woman since Serena Williams to get to the finals at Wimbledon and the French Open in the same year.
The Italian had lost to Poland's world No.1 Iga Swiatek in the title match at Roland Garros last month.
Carlos Alcaraz's second consecutive championship at the All England Club, and fourth major title overall, did not affect his ranking.
The Spaniard stayed at No.3, with Italian Jannik Sinner still No.1 despite losing in the quarter-finals.
Runner-up Novak Djokovic held on to the No.2 spot after being defeated by Alcaraz 6-2 6-2 7-6 (7-4) in the final.
There was no movement in the rest of the ATP's top five either, with Alexander Zverev at No.4 and Daniil Medvedev at No.5.
However, Australia's top-ranked player Alex de Minaur moved from No.9 to a career-high No.6 by reaching the quarter-finals.
The Australian was supposed to meet Djokovic at that stage, but was forced to withdraw because of an injured hip.
Swiatek remained at No.1 in the WTA rankings despite a third-round loss at the All England Club.
The rest of the top four was unchanged, with Coco Gauff at No.2, Aryna Sabalenka at No.3, and Elena Rybakina at No.4.
Marketa Vondrousova, who won Wimbledon a year ago and was defeated in the first round this time, slid from No.6 to No.18.
Ons Jabeur, runner-up at the grass-court grand slam tournament in 2022 and 2023, went from No.10 to No.16 after bowing out in the third round this year.
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