Hear me out...Who is the greatest American athlete of all-time?

I know it's anticlimactic to spoil the answer in the subhead but I'm going Quentin Tarantino with it and telling you the ending now and work backwards from there

I've wanted to write something on Serena Williams for a while. Originally, I wanted to write a column on how underappreciated she is, after her dominant Australian Open victory, but I was on a role in the NFL playoffs and she got pushed t...