Cooper Williams (born June 17, 2005) is an American professional tennis player. He has a career-high ATP singles ranking of No. 562 achieved on June 15, 2026 and a highest doubles ranking of No. 473 achieved on September 8, 2025.
Williams won the boys' doubles title at the 2023 Australian Open, with countryman Learner Tien.
Early life Born and raised in New York City, Williams attended St. Bernard's School on the Upper East Side from Kindergarten to seventh grade. He graduated from Dwight School Global in June 2023. Williams relocated to Boca Raton, Florida during the Covid pandemic, where he works with fitness coach, Richard Woodruff.
Junior career Alongside partner Learner Tien, Williams won the junior Australian Open doubles in January 2023, defeating Alexander Blockx and João Fonseca in the final 6–4, 6–4.
He reached an ITF junior combined ranking of world No. 3 on August 28, 2023.
Professional career In August 2025, he made his main draw grand slam debut alongside Theodore Winegar at the 2025 US Open, having received the US collegiate wildcard into the men's doubles having won the inaugural American Collegiate Wildcard Playoff in Orlando. In the first round they defeated Czech pairing Petr Nouza and Patrik Rikl in straight sets before facing previous finalists and the No. 4 seeds Kevin Krawietz and Tim Puetz.
College Williams played his Freshman season of college tennis at Harvard, where he earned All-America singles status and 2024 NCAA Rookie of the Year. He led the Crimson to its highest NCAA ranking in program history, #6 in the nation. Williams now plays for Duke University.
ITF World Tennis Tour finals
Singles: 3 (3 titles) LegendITF WTT (3–0)
ResultW–LDateTournamentTierSurfaceOpponentScoreWin1–0M15 Monastir, TunisiaWTTHard Marcus Walters6–3, 6–1Win2–0M15 Monastir, TunisiaWTTHard Luca Potenza6–3, 7–5Win3–0M15 Gaborone, BotswanaWTTHard Constantin Bittoun Kouzmine6–2, 6–2
Doubles: 6 (4 titles, 2 runner-ups) LegendITF WTT (4–2)Finals by surfaceHard (4–2)Clay (–)
ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1M25 Edwardsville, USWTTHard Kweisi Kenyatte Makoto Ochi Seita Watanabe6–7(1–7), 3–6Loss0–2M15 Memphis, USWTTHard Alex Michelsen Millen Hurrion Finn Reynolds0–6, 1–6Win1–2M15 Fayetteville, USWTTHard Alessio Basile Adrien Burdet Melvin Manuel6–4, 6–3Win2–2M25 Calabasas, USWTTHard Edward Winter Rohan Murali Elijah Strode6–2, 6–3Win3–2M15 Winston-Salem, USWTTHard Daniel Milavsky Ryan Fishback Henry Lieberman6–1, 6–1Win4–2M15 Monastir, TunisiaWTTHard Matthew Rankin Daniil Bogatov Evgenii Tiurnev6–3, 5–7, [10–5]
Junior Grand Slam finals
Doubles: 1 (title) ResultYearTournamentSurfacePartnerOpponentsScoreWin2023Australian OpenHard Learner Tien Alexander Blockx João Fonseca6–4, 6–4
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