Patten is a two-time Grand Slam champion in doubles, having won the 2024 Wimbledon Championships and the 2025 Australian Open with Harri Heliövaara.

[2] Patten partnering with Julian Cash reached his first ATP final at the 2023 U.S. Men's Clay Court Championships, losing to Jordan Thompson and Max Purcell in a deciding champions tiebreak.

[15][16] In May, Patten and Heliövaara defeated top seeds Andreas Mies and Neal Skupski in the final of the Turin Challenger.

[21][22] They defeated Australian duo Jordan Thompson and Max Purcell in the final, in a three-setter with three tiebreaks, saving three match points, to win their first Grand Slam title together.

[29][30] Patten and Heliovaara were runners-up at the China Open in October, losing in the final to top seeds Simone Bolelli and Andrea Vavassori.

[32][33] They followed this by reaching the semifinals at the Vienna Open, losing in a deciding tiebreak to wildcards and eventual champions Alexander Erler and Lucas Miedler after squandering two match points.

[36][37] At the ATP Finals, Patten and Heliövaara defeated world No.1 team Marcel Granollers and Horacio Zeballos in straight sets in their first group match.

[40][41][42] Patten and Heliövaara then secured first place in their group by winning their third match against Wesley Koolhof and Nikola Mektic in a deciding champions tiebreak.

[56] Partnering Olivia Nicholls, he also reached the mixed doubles semifinals after overcoming top seeds Andrea Vavassori and Sara Errani in the second round[57] and then Jackson Withrow and Irina Khromacheva in the quarterfinals.