Ouahab took advantage of all four of his break-point opportunities to beat the 51-ranked Haase 6-3 6-2 and secure a second-round clash with Spanish qualifier Sergio Gutierrez-Ferrol, who beat Portugal's Rui Machado 6-2 6-1.

Frenchman Paul-Henri Mathieu ended the hopes of home wild-card Mehdi Ziadi 6-3 6-1 in just 67 minutes, while Tunisia's Malek Jaziri retired when trailing 6-2 3-0 to Victor Hanescu of Romania.

Seventh seed Albert Ramos beat fellow Spaniard Pere Riba 6-2 6-3 while there were also wins for Jeremy Chardy, Matthias Bachinger and Italian pair Potito Starace and Flavio Cipolla.