Some big names came out for the third-annual event.
Jamaican sprinter Usain Bolt leads the way.
It happened just as he arrived in Houston.
Dan Cruz makes the case for Josh Cox as the wildcard qualifier for the men's Olympic Marathon team.
Many Olympic Trials qualifiers using the race as a tune-up.
Near-perfect conditions draws record crowds for the 14th edition.
Check out a random collection of cool shots from the world of running!