The day before and after the MLB all star game Christmas and Easter
Michael Jordan's son
Dion Sanders , Played pro football for cowboys ,then played pro baseball for the braves.
Not that I know of, there have been many who played 2. Micheal Jordan played Basketball and Baseball. Ricky Hatton played soccer before pro boxing and Steve Nash played soccer, (not sure if pro) before Basketball.2 pro sports is enough for one lifetime ;)
Indoor sports, football, soccer, and lacrosse.
Yes Bo Jackson Pro football and Pro baseball
Less than 1%
No Sabre is good at one sport.