Valtteri Bottas has hailed the effect of his Sauber teams latest upgrades on car performance after qualifying 13th for the Qatar Grand Prix and finishing 12th in the sprint event but acknowledged the improvement has come rather late for him.Bottas is out of an F1 race drive next year since all the other seats are filled, and he and Zhou Guanyu are to be replaced by Nico Hulkenberg and ... Keep reading
