Back at the track, retired Rosberg shows no signs of regret Retired Formula One champion Nico Rosberg seemed to be having a good time at the track Check out this story on USATODAY.com: http://usat.ly/2lz3iKk Formula One World Champion Nico Rosberg is surrounded by cameramen as he visits his former Mercedes team during a Formula One pre-season testing session at the Catalunya racetrack in Montmelo, outside Barcelona, Spain, Wednesday, March 1, 2017. BARCELONA, Spain – Retired Formula One champion Nico Rosberg seemed to have a good time, and no regrets, on Wednesday at the track.