Career
He was coached by Jérôme Potier of CNE Roland Garros. Several injuries have slowed his progress between 2005 and 2007. After another blank year in 2015, he announced his retirement from professional circuit to concentrate on his reconversion.
In 2004, he took part to the Junior Australian Open, losing in the final match to fellow Frenchman Gaël Monfils (6-0, 6-3).
Soon afterwards, he took part his first Challenger tournament in Cherbourg and reached the quarterfinals. In 2007, he reached the quarterfinals at Tunica and Freudenstadt tournaments.
In 2008, he reached the quarterfinals of four Challenger tournaments early in the season. He played his first Roland Garros as a lucky loser, but lost to Argentina"s Juan Martín del Potro in straight sets (3-6, 2-6, 3-6) in the first round.
He then lost twice in the quarterfinals of French Challenger tournaments, before winning the Rennes Challenger tournament against Adrian Mannarino.
Josselin Ouanna made himself known at the Lyon tournament, where he defeated World #46 Ivan Ljubičić, then Nicolás Lapentti before losing to Gilles Simon. This performance qualifies him for the first Masters France. However, he was eliminated in the pool stage against Julien Benneteau, Gilles Simon and Marc Gicquel.
Ouanna was awarded a wild card for the 2009 French Open, granting him a second Grand Slam appearange.
He went through the first round by eliminating the Spaniard Marcel Granollers in five sets (7-5, 2-6, 3-6, 7-6, 6-1). In the second round, he beat one of his childhood heroes, 20th seed and former World #1 Marat Safin, who was playing his last French Open, in five sets (7-62, 7-64, 3-6, 4- 6, 10-8).
This victory, his first against a Top 30, made him known to the public. Ouanna then lost in the third round to Fernando Gonzalez in straight sets (7-5, 6-3, 7-5).
At the 2009 United States Open, he lost to González once again, this time in the second round.
After the tournament, he entered the Top 100 for the first time. At the 2010 French Open, he beat Łukasz Kubot in the first round before losing to Jo-Wilfried Tsonga in the second round. After Nicolas Mahut forfeited his spot for the tournament, Ouanna retrieved a wild-card to take part to the 2013 Australian Open.
He lost to Alejandro Falla in the first round, in straight sets (4-6, 5-7, 4-6).