Thomas Luthi (12), of Switzerland, and Randy Krummenacher (4), of Switzerland, take part in an open practice session for the MotoGP Grand Prix of the Americas MotoGP motorcycle race at the Circuit of the Americas, Friday, April 11, 2014, in Austin, Texas. (AP Photo/Eric Gay)

Photos: MotoGP at COTA

Thousands of visitors pour into Austin from April 11 to 13 for the MotoGP, the F1 of motorcycle races, at the Circuit of the Americas.