Eventually Giltaire’s defences were breached on lap five of 10 when Boya blasted ahead on the straight approaching Lisboa.
Nael then produced a near-identical move on Giltaire on the following tour, but Slater’s lead was too huge for the Pinnacle pair to make any serious inroads.
However, both Boya and Nael traded fastest laps with Slater in the closing stages and demonstrated their potential when running in clear air.
Giltaire had to settle for fourth, while his ART GP team-mate Taito Kato was fifth and Enzo Deligny was sixth, although the R-ace GP driver is another who faces an investigation into possible pre-race speeding in the pitlane.
The only major incident of the race came on the first lap as the field bunched into the Melco Hairpin and Oscar Wurz collided with Charles Leong, but Wurz was able to guide his damaged car into the escape road to avoid the need for a caution.
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