Kaylan Bigun‎

Kaylan Bigun (born May 23, 2006) is an American tennis player. He has a career-high ATP singles ranking of No. 507 achieved on June 29, 2026 and a doubles ranking of No. 1,740 achieved on December 4, 2023.

After winning the boys' singles title at the 2024 French Open, he reached a ITF junior combined ranking of No. 1 on June 10, 2024.

Early life Bigun was born in Los Angeles. His father, Dimitry, was born in Ukraine but moved to Los Angeles when he was a teenager. He is Jewish.

He trains in California and the USTA Center in Florida. His twin brother, Meecah Bigun, is also a tennis player. In January 2024, he signed a letter of intent to play tennis at the University of California, Los Angeles.

Junior career Bigun represented the United States at the 2022 Junior Davis Cup in Antalya, reaching the final. His twin brother, Meecah, was also on the team. In 2023, he was a reached the singles quarterfinals of Wimbledon and the semifinals of the Junior Orange Bowl.

In 2024, at the Australian Open, he reached the quarterfinals in singles and the semifinals in doubles with partner Jagger Leach. Bigun became the first American player to win the junior boys' singles title since Tommy Paul in 2015. Following his victory, he became the junior world No. 1, surpassing Rei Sakamoto.

Professional career In April 2024, Bigun qualified for the main draw of the Sarasota Open.

Junior Grand Slam finals

Singles: 1 (title)