On his route to the final he won in three sets against Australian Bernard Tomic in the semifinals and finished runner-up to German Denis Gremelmayr.

[6] He made his Grand Slam main draw debut at the 2015 Australian Open, where he defeated Pablo Andújar.

[8][9] At the 2015 's-Hertogenbosch Open, Copil defeated Jarkko Nieminen and Guillermo García López as a wildcard to reach the quarterfinals.

[6][1] Copil reached his first ATP World Tour-level singles final at the Sofia Open, where he lost to Mirza Bašić.

93, Copil reached the final of the Swiss Indoors in Basel as a qualifier, losing to Roger Federer after defeating world No.

[11] Copil reached the 2019 Australian Open second round for the second time defeating Marcel Granollers in straight sets.

[1][4] His best showing in doubles at a Grand Slam in his career was reaching the third round of the 2019 French Open partnering Rohan Bopanna.