Russell set for Singapore GP grid penalty after engine failure

George Russell is set to start from the back of the grid at Sunday's Singapore Grand Prix due to a power unit change in a further blow to his championship hopes.

Russell suffered a power unit failure late in Sunday's Bahrain Grand Prix in Malaysia when running third, forcing him to retire while his Mercedes team-mate Kimi Antonelli finished second to extend his lead over the Brit at the top of the Drivers' Championship to 84 points with seven rounds remaining.