Olympic gold medalist Noah Lyles calls off speed showdown against Tyreek Hill, cites 'personal reasons'

In February, Super Bowl winner and speedy wide receiver Tyreek Hill and the "world's fastest man," Noah Lyles, appeared to reach an agreement. 

While the two sports stars agreed to square off in a race to determine who really is the fastest, the highly anticipated event won't actually happen, according to Lyles. 

The 27-year-old, who won gold in the 100 meters at last summer's Paris Olympics, attended this week's Cannes Lions Festival in France. During an onstage appearance, Lyles...