Frank Williams gave Regazzoni his final drive in a competitive car alongside Alan Jones. The Williams FW07 proved to be very competitive, especially in the final part of the season, with FW07s winning all but two of the final seven races of the 1979 calendar. The first win was for Regazzoni, at Silverstone, the first of over 100 victories for the Williams Grand Prix team. In deference to the team's Saudi sponsors, he celebrated on the podium with Lilt. However, despite his achievement, once again he was replaced by Carlos Reutemann at the end of the season. At the Italian Grand Prix, motor sport journalist Nigel Roebuck asked Regazzoni why he continued to drive at the age of 40, with no prospect of a competitive seat. Regazzoni replied, "I love [Formula One], and most of all I love to drive racing cars. So why should I stop when I feel this way?". At the end of the year he was invited to compete in the 1980 International Race of Champions, the last active Formula One driver, alongside Mario Andretti, to do so.