Russian rookie Nikita Mazepin needs to grow up and has not been let off the hook for causing offence with a video on social media last month, his Haas Formula 1 team boss Guenther Steiner said on Friday. The 21-year-old driver, whose father is a fertiliser billionaire, angered the team when images of a female […] The post Steiner: Mazepin needs to grow up appeared first on GRAND PRIX 247.