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Former US Open champions Serena and Sloane Stephens are set to compete at the event set to begin on August 10.
The WTA also announced a revised system for calculating world rankings when the season resumes.
Barty, 24, made the Australian Open semifinals in January but skipped the US Open and her French Open title defence citing a lack of preparation.
Osaka said she and her sister had been in shallow waters but she noticed a current had taken them away from the shore.
The unseeded Indo-Ukrainian pair pipped the second seed Chinese team 6-4 6-4 in one hour 21 minutes.
Sania and Kichenok got the better of the Slovenian-Czech pair of Tamara Zidansek and Marie Bouzkova 7-6 (3), 6-2.
Sania and Kichenok prevailed over Oksana Kalashnikova of Georgia and Japan's Miyu Kato 2-6, 7-6 (3), 10-3 to enter the quarterfinals of the WTA Hobart International.
Jil Teichmann, who won both of her two WTA titles at clay court tournaments last year, defeated American Shelby Rogers in the other semifinal.
American Brady beat Switzerland's Jil Teichmann 6-3, 6-4 in the final.
The WTA did not name the player but said she had pulled out and all those who may have been in close contact with her were being tested.
Results 141-150 of 175
