[1] Sakamoto won the 2024 Australian Open boys' singles title after defeating Jan Kumstát in three sets.

[2][3] Partnering Maxim Mrva, he also won the boys' doubles at the 2024 US Open, defeating Denis Peták and Flynn Thomas in the final.

[4] He received a wildcard for qualifying competition at the 2024 Miami Open but lost to Vít Kopřiva in the first round.

[5] 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.

[6][7] Sakamoto received a wildcard for the qualifying competition at the 2025 Australian Open.