[5] In 2023, he and Toby Samuel became the number one ranked doubles team in Collegiate tennis.

In 2019 he reached the quarterfinals of the Boys’ doubles at the 2019 Wimbledon Championships alongside Jacob Fearnley.

[7] In 2020 he was included as part of Tennis Scotland’s new national player programme.

[8] In June 2023, Thomson received a wildcard with his partner Toby Samuel for the Men's doubles at the 2023 Surbiton Trophy and the pair beat the second seeds Andre Goransson and Ben McLachlan in straight sets before losing to eventual finalists Alexei Popyrin and Aleksandar Vukic in the quarterfinals.

[11][12] They won their opening match against Pedro Cachin and Yannick Hanfmann.