The Mercedes driver benefitted from Alonso's 10-second penalty, which he was handed because his pitcrew worked on his car during his pitstop before he served his full five-second penalty, which he had initially picked up for incorrectly lining up on his grid spot at the start of the race.
Alonso's second penalty, announced after the podium ceremony when he had celebrated his 100th F1 career rostrum finish, promoted Russell into third place in the final results.
