At the 2019 African Games, he won the gold medal at the men's doubles event with countryman Aziz Dougaz.

Mansouri made his ATP Tour main-draw debut at the 2015 Winston-Salem Open, in the doubles draw partnering Christian Seraphim.

99 on 29 January 2024 when he won a Challenger title at the 2024 BW Open with Luke Johnson.

[2][3] Partnering Nicolás Barrientos, he was runner-up at the 2024 Almaty Open, losing to Rithvik Choudary Bollipalli and Arjun Kadhe in the final.

[4][5] Playing with Ivan Dodig, Mansouri reached the final at the 2024 Belgrade Open, losing to Jamie Murray and John Peers.