A comfortable win for Kevin Magnussen, who took the chequered flag five seconds in front of Nico Müller.
The Colombian Carlos Huertas (Carlin) mastered the wet conditions to top the podium from Sergey Sirotkin (ISR) and Stoffel Vandoorne (Fortec Motorsports).
Today the World Series by Renault drivers tested on the Paul Ricard circuit in preparation for the weekend's event in France.
Second victory of the 2013 Formula Renault 3.5 Series (WSR) for Stoffel Vandoorne; this time at his home race in Belgium. However with his third place on the podium today, Kevin Magnussen still retains the points lead.
Stoffel Vandoorne set the fastest practice time for the World Series by Renault event in Monaco but he paid high price for "dangerous driving" by the stewards with a five-place grid penalty.
The next WSR meeting will take place at Moscow Raceway in Russia on 22-23 June.
The Dane duly delivered at Paul Ricard, winning race one from Antonio Félix da Costa (Arden Caterham) and Stoffel Vandoorne (Fortec Motorsports).
World Series by Renault returns to Moscow Raceway
On Formula Renault 3.5 Series, Kevin Magnussen edges closer to the title.
Two pole positions, a victory and a third place crowned the French squad's efforts on the Spa circuit.
Despite the rain relenting for the day’s opening session, the Belgian track was still damp when the drivers emerged.
Rain fell hard on Motorland Aragon for the whole day, meaning that today's two sessions were held on a soaked track.