On the final lap at the Brands Hatch Grand Prix circuit, Pietro Fittipaldi took his first victory in the BRDC F4 Series.
Emerson Fittipaldi joined his grandson, Pietro, at Siverstone.
Both qualifying on Saturday and Sunday were a gamble on whether to put rain tyres, or to stay on slicks.
Momentum continues to build for Derek Hagar, who improved to 3-for-4 on the season with another victory last Saturday at I-30 Speedway.
Mark Burch Motorsports and driver Danny Lasoski kicked off this season as strong as the program ended last year.