Liberty Media have already lobbied for Sergio Perez to stay at Red Bull. And now F1’s commercial rights could come to the aid of another driver. Liberty urged Red Bull to keep Perez because they feared a major drop in revenue at the Mexico City Grand Prix if he wasn’t competing. Executive director Helmut Marko has denied that external influences held sway. The American company have owned the Formula 1 group since the beginning of 2017. The sport has seen impressive growth under their stewardship, perhaps most notably through Netflix’s Drive to Survive series. The calendar has now expanded to a…