Cooper Williams (born June 17, 2005) is an American professional tennis player. He has a career-high ATP singles ranking of No. 660 achieved on September 29, 2025, and a best doubles ranking of No. 473 reached on September 8, 2025.
Williams won the boys' doubles title at the 2023 Australian Open, with countryman Learner Tien.
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.
Alongside partner Learner Tien, Williams won the junior Australian Open doubles in January 2023, defeating Alexander Blockx and João Fonseca in the final 6âÂÂ4, 6âÂÂ4.
He reached an ITF junior combined ranking of world No. 3 on August 28, 2023.
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.
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.