Tahlia Kokkinis (born 11 August 2008) is an Australian tennis player who has competed on the international junior circuit and begun appearing in professional events on the ITF Women's World Tennis Tour. She reached the girls' singles quarterfinals at the 2025 Australian Open.
Kokkinis has represented Australia in international junior team competition and has won professional titles on the ITF circuit as part of her transition from junior to senior-level tennis.
Kokkinis is of Greek descent and was born on 11 August 2008 in Sydney. She is based in Brisbane, Queensland, and is completing her secondary education through online study. She began playing tennis at an early age and progressed through Tennis Australia's junior development pathways.
Kokkinis recorded early national success by winning the girls' 12-and-under singles title at the 2021 Australian Junior Claycourt Championships.
In 2023, she represented Australia at the Junior Billie Jean King Cup Finals in Spain. During the round-robin stage, she won both of her singles matches, contributing to Australia's progression to the quarterfinals. In 2024, Kokkinis was selected to represent Australia at the Junior Billie Jean King Cup Asia-Oceania qualifying events in Kazakhstan, as part of the national junior team.
Her results on the ITF World Tennis Tour Juniors circuit improved steadily through 2024, when she reached a career-high junior ranking of world No. 141.
Kokkinis entered the 2025 Australian Open girls' singles tournament as a wildcard. She defeated Rositsa Dencheva, Kanon Sawashiro, and Brooke Black to advance to the quarterfinals, marking her first appearance at that stage of a junior Grand Slam. Her tournament run ended with a quarterfinal loss to Wakana Sonobe of Japan.
In 2025, Kokkinis made her debut at the Wimbledon junior championships, reaching the round of 16 in the girls' singles event.
Alongside her junior career, Kokkinis began competing in professional ITF tournaments. In March 2024, she won her first professional doubles title at the ITF W35 Mildura International, partnering Alicia Smith.
In June 2025, Kokkinis won an ITF W15 tournament in Monastir, Tunisia, defeating Sofia Camila Rojas in the final, and claimed her first professional singles title. Later that year, she won the ITF W35 Tauranga singles title on hard courts, defeating Mio Mushika after her opponent retired during the final.
Kokkinis was awarded a qualifying wildcard for the women's singles event at the 2026 Australian Open, placing her in the qualifying draw at Melbourne Park.
Kokkinis plays right-handed and has described her playing style as aggressive. She achieved a career-high WTA singles ranking of No. 486 on 29 December 2025.
Between 2024 and 2025, Kokkinis won multiple singles titles on the ITF World Tennis Tour Juniors circuit. Her victories included J60-level tournaments in Lautoka, Fiji, as well as J200 events in Sydney and Istres, where she recorded wins on both hard and clay courts. In 2025, she also won a doubles title at the J200 Open Tennis D'Istres, partnering Capucine Jauffret of USA.