Marius Copil

In September 2009 he received wild card access to the main draw of 2009 BCR Open Romania, where he defeated his fellow countryman Victor Crivoi in the first round, but lost to Spaniard Rubén Ramírez Hidalgo in the second round.

In May 2010, Copil reached his first ATP Challenger Tour final at the Trofeo Paolo Corazzi as a qualifier. 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.

Season 2011 started well for Copil. He reached his second Challenger final at the Tretorn Serie+ event in Kazan, Russia. In the final, he won against 4th seeded German Andreas Beck, in straight sets.

In season 2012, Copil beat world No. 13 Marin Čilić in the first round at the China Open in Beijing.

He made his Grand Slam main draw debut at the 2015 Australian Open, where he defeated Pablo Andújar. At the same tournament, he recorded the fastest serve at a Grand Slam: 242.0 km/h (150.4 mph).

At the 2015 Romanian Open in April, partnering fellow Romanian Adrian Ungur, after saving five match points, they defeated Nicholas Monroe/Artem Sitak 17–15 in the match tiebreak to become the first Romanian team to win the Bucharest title since 1998 (Pavel/Trifu).

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

He made his top 100 singles debut after the 2017 Mutua Madrid Open, where he was a wildcard entry, at World No. 90 on 15 May 2017.

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

Ranked No. 93, Copil reached the final of the Swiss Indoors in Basel as a qualifier, losing to Roger Federer after defeating world No. 6 Marin Čilić and No. 5 Alexander Zverev on the way, his first ever wins over top-10 players. He became the lowest-ranked Basel finalist since No. 100 Patrick McEnroe in 1994 and 1st qualifier in the final since Baghdatis in 2005.

Copil reached the 2019 Australian Open second round for the second time defeating Marcel Granollers in straight sets. As a result, he reached a career-high singles ranking of No. 56 on 28 January 2019.

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. He also reached the second round of the 2019 US Open for the first time in his career in singles and doubles.