Antonia Ružić (born 20 January 2003) is a Croatian tennis player.
Ružić has a career-high singles ranking of No. 50 by the WTA, achieved on 13 July 2026. She also has a career-high WTA doubles ranking of No. 544, reached on 27 January 2025. Ružić has won 12 singles titles on the ITF Women's Circuit.
Ružić is a member of the Croatia BJK Cup team, having made her Fed Cup debut in 2020.
2024: WTA Tour debut and first quarterfinal
On her WTA Tour debut as a qualifier at the 2024 Jasmin Open in Monastir, Tunisia, Ružić reached the quarterfinals with wins over fourth seed Nadia Podoroska and Lily Miyazaki, before losing to seventh seed Lucia Bronzetti.
2025: Major, top 100 and WTA 1000 debuts
Following the 2025 French Open, Ružić made her top 100 debut on 9 June 2025, at world No. 98.
Ružić reached her second WTA Tour quarterfinal at the WTA 500 2025 Monterrey Open, as a qualifier, with wins over eighth seed Anastasia Pavlyuchenkova and Elisabetta Cocciaretto before falling to Marie Bouzková.
Ružić made her major debut at the 2025 US Open, losing to Taylor Townsend in the first round.
Ružić entered the main draw of the WTA 500 2025 Ningbo Open as a lucky loser but lost to Veronika Kudermetova.
2026: WTA 1000 quarterfinal & top 10 win, top 60
At the 2026 Dubai Tennis Championships, Ružić reached her first WTA 1000 quarterfinal, after entering the main draw as a lucky loser, and defeating Emma Raducanu, fellow lucky loser Anastasia Zakharova and reigning Australian Open champion and world No. 3, Elena Rybakina, her first top-10 win. She lost in the last eight to seventh seed Elina Svitolina in three sets. Despite the loss Ruzic reached a new career-high singles ranking of world No. 51 on 23 February 2026.
Singles: 15 (12 titles, 3 runner-ups)
Ružić has a 1–1 record against players who were, at the time the match was played, ranked in the top 10.
Key: (Rk) first use, opponent rank; (Rd) round; (Rk) 2nd use, player rank; (Ref) reference; (F) final; (SF) semifinal; (QF) quarterfinal; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualifying rounds or stages (3), 2, 1.
Antonia Ružić at the Women's Tennis Association
Antonia Ružić at the Billie Jean King Cup