Along the way, he beat future top ten singles players like Andy Murray, Tomas Berdych, Gaël Monfils and Jo-Wilfried Tsonga.

With renewed focus on the doubles game, his rankings rose steadily, playing alongside the likes of Andrei Daescu and Philipp Marx.

After reaching thirteen challenger finals within little over a year, Mergea won his first ATP title in October 2013, when he teamed up with Lukas Rosol for the Erste Bank Open, Vienna.

After starting 2015 with Dominic Inglot and reaching two finals, his injury plagued British partner needed time to recover.

1 team of Mergea's Davis Cup and former juniors' partner, Romanian Horia Tecău, who played alongside Jean Julien Rojer.

He won the 2016 BRD Năstase Țiriac Trophy[4] and the silver medal at the 2016 Olympic Games in Rio de Janeiro, alongside compatriot Horia Tecău.