The biggest surprise from the controversial Enhanced Games in Las Vegas did not come from an athlete using performance-enhancing drugs. Instead, it came from American swimmer Hunter Armstrong, who stayed completely drug-free and still beat competitors who openly used PEDs during the event.

Athletes say they're as healthy and well-paid as ever. Critics say the whole idea is dangerous. On Sunday, the first Enhanced Games arrive.

Dozens of athletes — including former Olympians — will participate in the Las Vegas event while using performance-enhancing drugs.