Answer
Fernando Alonso, a two-time Formula 1 World Champion, and Simon Pagenaud, an IndyCar Series champion, have competed against each other in the IndyCar Series. Alonso made his IndyCar debut in 2017 and competed in the Indianapolis 500 and a partial IndyCar schedule, while Pagenaud has been a full-time IndyCar driver since 2012 and has won the championship in 2016.