Q&A with Red McCombs When the Formula One U.S. Grand Prix revs its engines at last today at the Circuit of the Americas complex in southeast Austin, arguably the most interested spectator will be San Antonio billionaire Red McCombs. McCombs, 85, is the prominent investor in the $300 million project, which muscled through lawsuits and other hurdles to get constructed in time for today's event. [...] this is the kind of chance to have a meaningful role in something that could capture so much of the opportunity for that sport from people all over the world. On whether he was prepared for weathering the challenges of getting the 3.4-mile circuit built: Some of the things that I thought would be more difficult turned out to not be difficult at all. On whether he ever expected, after working as an owner with the NBA and NFL, to have a stake in auto racing in Texas: It's more of a thrill than I could ever have imagined.