[11] Cash won his maiden ATP title defeating defending champion Santiago Gonzalez and his partner Neal Skupski.

[12] Returning to the ATP Challenger Tour, Cash and Galloway followed up their victory by winning a clay court event in Bordeaux, France, in May and then claiming the title at the Surbiton Trophy on grass the following month.

[13] He reached his fifth final, and second for the season with Galloway, at the 2024 BOSS Open but they were defeated by Brazilians Marcelo Melo and Rafael Matos.

[14] Cash won his second title at the 2024 Mallorca Championships defeating Diego Hidalgo and Alejandro Tabilo in the final in straight sets.

[16] Partnering with fellow Briton Lloyd Glasspool, he won the Japan Open, defeating Ariel Behar and Robert Galloway in the final.

[17][18] Playing alongside Lloyd Glasspool, Cash won the doubles title at the Brisbane International, defeating Jiří Lehečka and Jakub Menšík in the final.

[19][20] Cash and Glasspool defeated Ariel Behar and Robert Galloway in a deciding set tiebreak to reach the quarterfinals at the Australian Open,[21] where they lost to fourth seeds Kevin Krawietz and Tim Pütz.