Freddie Lindgren and Ricky Wells produced late heroics as Wolverhampton claimed a 52-38 win over Lakeside.
Jonathan Rea extended his World Superbike Championship lead to 50 points with a double victory in round four at Assen.
James Ellison powered in a winning second-round double at Brands Hatch to close to within six points of Shane Byrne.
Sheffield Tigers' Simon Stead broke his upper arm and femur after crashing at Rye House on Saturday.
World champion Marc Marquez was in dominant form in qualifying as he claimed pole position for the Argentina Grand Prix.
The opening meeting of the FIM World Speedway Championship was curtailed at the halfway point due to an unsafe track
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