Sebastian Vettel says he has not entertained the possibility of quitting Formula One at the end of the year and believes he is still driving at the top of his game.
After missing out on the championship last year in a straight fight with Lewis Hamilton, Vettel currently sits fourth in the standings following a mixed start to the year with just one podium finish from three races. His Ferrari team showed great promise in pre-season testing but has not fulfilled that potential in races and has been criticised for a series of team orders that favoured Vettel over his emerging teammate Charles Leclerc.