Billy Harris

Harris won his first ATP Challenger doubles title at the Winnipeg National Bank Challenger playing with Kelsey Stevenson, defeating Max Schnur and John-Patrick Smith in the final.

Harris reached his first singles Challenger final at the inaugural edition of the Challenger Club Els Gorchs in Las Franquesas del Valles, Spain, as a qualifier where he lost to second seed Hugo Grenier.

He made his ATP Tour debut at the Sofia Open, where as a qualifier, he defeated defending champion Marc-Andrea Huesler in the first round, before losing his next match to third seed Jan-Lennard Struff.

Given a wildcard entry into the Surbiton Trophy, Harris made it through to the semifinals with wins over eighth seed Juncheng shang, qualifier Tristan Schoolkate and Mikhail Kukushkin. His run was ended in the last four by eventual champion Lloyd Harris.

Entering as an alternate at the Nottingham Open Challenger, he overcame Coleman Wong, João Fonseca, and Mikhail Kukushkin to reach the semifinals, where he lost to qualifier Charles Broom.

Ranked No. 162, Harris received a wildcard for the main draw at Queen's Club and reached his first ATP Tour quarterfinal. En route, he defeated Tomás Martín Etcheverry and qualifier Giovanni Mpetshi Perricard. Despite losing in the last eight to Lorenzo Musetti, he broke into the top 150 in the rankings on 24 June 2024. His good form continued at the next grass court tournament, the Eastbourne International, recording wins over fellow wildcard Jacob Fearnley, lucky loser Charles Broom and Flavio Cobolli to make it through to his first ATP Tour semifinal, and as a result, reached the top 125 in the singles rankings. He lost to Max Purcell in three sets.

For his Grand Slam tournament debut, he received a wildcard for Wimbledon. Harris lost in the first round to Spain's Jaume Munar. He qualified for the main draw at the Hall of Fame Open in Newport, Rhode Island, going on to defeat Gabriel Diallo in the first round. He lost his next match to Mackenzie McDonald.

Harris made his debut for the Great Britain Davis Cup Team against Finland in Manchester in September, defeating Otto Virtanen in straight sets.

Harris started his 2025 season representing Great Britain at the United Cup in Australia, where he lost all three of his matches to Tomás Martín Etcheverry, Alex de Minaur and Hubert Hurkacz. Wins over Yuta Shimizu and Carlos Taberner saw him reach the final round of qualifying at the Australian Open for the first time, but a defeat to Kamil Majchrzak meant he missed out on a place in the main-draw. He represented Great Britain in their Davis Cup qualifier against Japan, but was beaten in both his matches against Yoshihito Nishioka and Kei Nishikori as the team lost the tie 3-2.

In February, Harris made it through to the semifinals at the Chennai Open Challenger, where his run was ended by Elias Ymer. The following week he defeated Eric Vanshelboim, James McCabe, Elias Ymer and Tristan Schoolkate to reach his second Challenger final at the Delhi Open, where he lost to Kyrian Jacquet. Completing a successful three weeks in India, Harris got to the semifinals at the Bengaluru Open Challenger, before losing to Brandon Holt.

The following month, Harris qualified in Miami making his debut at the tournament. He lost to wildcard entrant Eliot Spizzirri in the first round.

In June, he gained entry into the main-draw at the Eastbourne Open as a lucky loser and defeated fellow Briton Cameron Norrie and qualifier Mattia Bellucci to reach back-to-back quarterfinals at the tournament. Harris lost his last eight match to fourth seed Ugo Humbert. The following week at Wimbledon he won his first match at a major, defeating Dušan Lajović in straight sets to reach the second round, where he lost to Nuno Borges.

Harris qualified for the Washington Open, but lost to Cameron Norrie in the first round. Despite being defeated by Coleman Wong in the final round of qualifying at the US Open, he made his main-draw debut at the event after being awarded a lucky loser place. Harris was unable to make the most of his reprieve, losing in the first round to 25th seed Félix Auger-Aliassime in straight sets.

In September, Harris won his first ATP Challenger singles title at the Cassis Open Provence, defeating Daniil Glinka in the final.