HONOLULU — University of Hawai'i women's water polo head coach James Robinson announced the signing of Sienna Walker, who will join the team for the 2026 season.
 
A center from Perth, Western Australia, Walker brings more than a decade of experience across club, state and national teams. In 2024, she led the Fremantle Marlins to a runner-up finish in the Australian Water Polo League.
 
She also represented the U16 Australia team at the 2024 World Championships in Turkey and helped the team secure a bronze medal. In the semifinals, she delivered a standout performance earning player of the match honors with a match-high four goals to lead Australia past Italy, 13-8.
 
Her résumé also includes stints with the Australia junior squad (2023-25), Western Australia 18U team for the National Age Group Program (2022-25) and Melville Water Polo Club Juniors (2016-25).
 
Walker becomes the 19th Australian player to join the Rainbow Wahine program, and adds to UH's international representation on the 2026 roster alongside fellow Aussies Tara Logan and Lola Annear. The roster will feature 22 players from seven countries and the 'Bows will look to build on back-to-back Big West Championships and a National Collegiate Water Polo Championship semifinal appearance.