[2][3] Kuhn won the 2017 French Open – Boys' doubles title and reached the singles final of the same tournament.

Kuhn won his first ATP Challenger Tour title as a qualifier at the Sparkassen Open in Braunschweig.

Kuhn got to the finals of the Budapest Indoor Challenger Open in February 2018, but lost to ATP Tour veteran Vasek Pospisil in three sets.

He defeated Darian King to win his maiden ATP main draw match.

He became the youngest Spaniard since Rafael Nadal to win a match on the ATP World Tour.