Jack Doohan unexpectedly on the brink of huge F1 opportunity

Ryo Hirakawa is stepping into Esteban Ocon's Haas for the Mexico City Grand Prix. But it is far from certain that he will see out the rest of the F1 season in the car.

Haas caused a stir on Saturday by announcing that Ocon would take no further part in the remainder of the race weekend in Mexico. The team gave no reason for the sudden switch, although it confirmed that Ocon is not ill.