At the French Open, he reached the third round as a wildcard, after a second-round victory against Radek Štěpánek in five sets, 3–6, 6–1, 0–6, 6–4, 6–4.

He also reached the third round at Wimbledon, beating 24th seed Juan Ignacio Chela in straight sets along the way, and made the top 100 for the first time as a result.

At the Delray Beach International Championships, Roger-Vasselin defeated four opponents including top seed John Isner to reach his first ATP tournament final.

Vasselin made a breakthrough in the indoor part of the season when he has reached semifinals of the ATP 500 event in Basel, upsetting home favorite Stan Wawrinka in the first round.

The pair won the title in Marseille in February, beating Paul Hanley and Jonathan Marray in the final.

The pair made another quarterfinal, this time at a Masters 1000 event, in Monte Carlo, losing to the Bryan brothers.

The highlight of the season and of his career was the 2014 French Open title, which he and Benneteau won against the Spanish pair of Marcel Granollers and Marc López.

On grass, they made the semifinals of the Queen's Club tournament, losing to Jamie Murray and John Peers.

They followed this up with a quarterfinal appearance at 2014 Wimbledon Championships, where they lost to the French pair of Michaël Llodra and Nicolas Mahut.

On the hard-court North American swing, they reached the quarterfinals (l. to Nestor and Zimonjić) in Toronto, and the semifinals in Cincinnati (l. to Vasek Pospisil and Jack Sock).

At Indian Wells, Roger-Vasselin and partner Santiago González advanced to the finals of the Masters 1000 series event, losing to John Isner and Jack Sock.

[citation needed] Both Roger-Vasselin and Gonzáles and the Bryan brothers were coached by Dave Marshall during those runs.

[citation needed] Unseeded he reached his sixth Masters final at the 2023 Miami Open with Santiago González (tennis) after defeating Americans Jackson Withrow and Nathaniel Lammons.