Huge Jamaican sprinter Usain Bolt and tiny American gymnast Simone Biles seek to add to their fame in events with gold medals on the line in Day 9 on Sunday.
The 6'5", 207-pound Bolt has won the 100 meters, 200 meters and 4x100-meter relay each of the past two Olympics, and he plans to do it again.
"I'm going to win the 100," Bolt told CNN's Amanda Davies this month. "I never try to predict times, I avoid that because you never know. I'll win all three gold; there's never anything else for me when it comes to a championship.