Brit Chilton steps up onto 2013 grid

■ FORMULA ONE: British racing driver Max Chilton is expected to drive for Marussia next season, having been promoted from reserve driver. The 21-year-old was their testing and reserve driver for the second half of the 2012 season. Chilton will become the fourth British driver on the grid for 2013 along with Jenson Button, Lewis Hamilton and Paul Di Resta.