Deion Sanders isn't walking through that door. Neither is Bo Jackson. In the late 1980s and early 1990s, both Sanders and Jackson excelled in two professional sports, the MLB and the NFL.
Today, that is nearly unheard of. With the amount of training that goes into every offseason and the amount of money that owner have invested in their players, a multi-sport star is impossible to imagine in 2011.
That's not to say that there aren't guys out there who are athletic enough to do it. Alex Rodriguez and LeBron James are two of the most athletic people on the planet, and it's not inconceivable to imagine them playing another sport.
In no particular order, here are 10 athletes who could excel in a sport other than their own.