George Russell says his final-lap retirement from the Singapore Grand Prix after clipping a wall was “such a pathetic mistake” and “truly heartbreaking” but that he is trying to overcome it quickly. Mercedes opted to take advantage of a late Virtual Safety Car to pit Russell out of second place and Lewis Hamilton from fourth, in an attempt to chase down Carlos Sainz and Lando Norris for the victory. The top two were holding Russell at bay when he clipped the wall turning in at Turn 10 on the final lap, causing him to crash out of third place and…