Zak Brown earlier this year teased he was working on a “mega” signing for McLaren’s fourth Indianapolis 500 seat and that it was up to the mystery driver if he wanted to enter the “Greatest Spectacle in Racing.” Valentino Rossi, the nine-time Grand Prix motorcycle racing champion, ultimately passed on the opportunity. The seat instead went to Ryan Hunter-Reay, the 2014 Indy 500 winner, in a deal announced last week.