is a Japanese professional tennis player. He has a career-high ATP singles ranking of No. 157 and a doubles ranking of No. 750, both reached on 23 February 2026. He is currently the No. 3 singles player from Japan.
Sakamoto has won three singles titles on ATP Challenger Tour. He represents Japan at the Davis Cup.
Sakamoto won the boys' singles title at the 2024 Australian Open, defeating Czech Jan Kumstát in the final.
He was also runner-up in the boys' doubles category at the 2024 French Open, with Italian Federico CinÃÂ. They lost to top seeds Nicolai Budkov Kjær and Joel Schwärzler in the final.
Later that season, Sakamoto was crowned a champion in doubles at the 2024 US Open, with Czech Maxim Mrva. The pair defeated Denis Peták and Flynn Thomas in the final.
He reached an ITF junior combined ranking of world No. 1 on 27 May 2024. He had remarkable results on the ITF junior circuit, maintaining a 114âÂÂ39 singles win-loss record.
In March, Sakamoto received a wildcard for qualifying competition at the Miami Open, an ATP 1000-level event, but lost to Czech VÃÂt Kopà Âiva in the first round.
At the age of 18 and five months, Sakamoto won his first title at the 2024 Yokkaichi Challenger becoming the second youngest Japanese titlist after Kei Nishikori to lift an ATP Challenger trophy in history. As a result he reached the top 500 in the rankings on 2 December 2024.
Sakamoto received a wildcard for the qualifying competition at the 2025 Australian Open.
Sakamoto made his Masters main draw debut at the 2025 Miami Open after qualifying, but lost to Alexandre Müller.
He won his second Challenger title at 2025 Cary Tennis Classic and reached new career-high ranking of world No. 206 on 14 July 2025, rising 85 positions up in the singles rankings. Sakamoto made history with winning his third title at home in Yokohama, becoming the first Japanese teenager to win three Challenger titles. As a result he reached the top 175 in the singles rankings at world No. 159 on 24 November 2025.
Sakamoto made his Grand Slam debut at the 2026 Australian Open after qualifying for the main draw, but lost to fellow qualifier Rafael Jódar in the first round. Having received a wildcard for the 2026 Miami Open, Sakamoto recorded his first ATP and Masters win defeating Aleksandar Kovacevic.