 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.Tour success continued in 2014, as he won the Royal Guard Open in Vina del Mar, with veteran Oliver Marach, and his first ATP 500 title at the International German Open in Hamburg, with Marin Draganja.