Osaka has had a lot of wins, which include her win at the US and Australian Open wins and a first-round win at this year's French Open before withdrawing over mental health issues.
Naomi Osaka and Ashleigh Barty are the two pre-tournament favourites for the US Open. But the women's singles field is a crowded one this year.
Aryna Sabalenka makes her debut at No.2, with Naomi Osaka falling to No.3. Meanwhile, Grigor Dimitrov and Gael Monfils return to the Top 20.
Naomi Osaka was stunned 3-6, 6-3, 6-3 by wild card entry Jil Teichmann in the Western & Southern Open's third round in Cincinnati.
The Japanese player came from a set down to beat the American teenager in her second-round clash at the Western & Southern Open.
Osaka decided to pledge the money from next week's Western & Southern Open to relief efforts in Haiti after the country was hit by a devastating earthquake.
Naomi Osaka crashed out of the third round of the Tokyo Olympics 2020 as her gold medal hopes evaporated.
Only 19 Indian athletes attended the ceremony, including flag-bearers - boxer Mary Kom and men's hockey team captain Manpreet Singh, who were accompanied by six officials.
After withdrawing from the French Open in the early stages, her decision to skip another major tournament will be a big blow for the grasscourt Grand Slam.
Osaka cited deteriorating mental health as the reason for not attending the press conferences at Roland Garros and has even pulled out of the Grand Slam.