[4] He recorded his first ATP win at the 2023 Argentina Open as a wildcard against his compatriot Federico Coria[5] and achieved his best ranking as world No.

[6][7] Díaz Acosta made his Grand Slam tournament main draw debut as a lucky loser at the 2023 French Open – Men's singles, but was defeated by Jason Kubler in the first round.

[citation needed] The following week at the 2024 Argentina Open Díaz Acosta reached back-to-back quarterfinals defeating compatriot and fourth seed Francisco Cerúndolo in straight sets.

He won his first ATP title without dropping a set the whole tournament, defeating third seed Nicolás Jarry in the final.

[20] He made his ATP Masters 1000 debut at the 2024 Miami Open, losing his first round match to Alexei Popyrin in straight sets.

[21] At the next Masters in Monaco, he entered the main draw as a lucky loser, but lost to Roberto Bautista Agut in straight sets in the first round.