He won his first ATP Tour match at the 2015 German Open against Guillermo García-López, when the world No.

At the 2018 French Open and in only his ninth pro tour match and his second major, Munar came from two sets down to defeat compatriot David Ferrer in the first round.

[3][4] In Morocco he defeated top seed Alexander Zverev for his first top-10 win, to reach the quarterfinals.

He reached his first ATP singles final at the 2021 Andalucia Open in Marbella, Spain where he lost to compatriot Pablo Carreno Busta.

[6] At the 2023 Chile Open he stunned top seed Lorenzo Musetti to reach the quarterfinals.