Ocon started two places ahead of Alonso in fifth, but having dropped behind Mercedes' George Russell, he had to fend off the Spaniard, the pair trading places several times in the early laps of the race.
Alonso eventually gained the upper hand, while Ocon lost a place to Valtteri Bottas, who along with Kevin Magnussen, had been able to join the fight as the Alpine drivers held each other up.
