William Byron won the Dayton 500, which was a marathon on Sunday night, after rain delays and yellow caution flags ultimately led to some overtime laps. 

And those two overtime laps were an absolute thrill that saw multiple spin-outs and crashes that allowed Byron to win the Daytona 500 for the second consecutive year.

Six of the last eight Daytona 500 races have ended in overtime. 

This is a developing story. More to come.