Deep in the third set Cobolli capped a gruelling 27-shot rally with a wrong-footing forehand winner, raising his fist to the crowd in a signal of intent to his title rivals.
However, his attention swiftly turned to the UEFA Champions League final later on Saturday between Paris Saint-Germain and Arsenal.
“Today, I don’t want to talk about tennis, there is the final of the Champions League,” insisted Cobolli, an ardent AS Roma fan, who was a former youth player at the Serie A club.
“Football was my first passion, I played football before tennis and I played with Riccardo Calafiori. I also like PSG because I love Luis Enrique.
“I don’t know who I will cheer for. I’m going to cheer for the best match ever with more than one goal.”