In 1869, the Cincinnati Baseball Club, better known as the Red Stockings, became the first all professional team. Two years later the National Association, the first major league of baseball, was formed.
Athletics is not a professional sport
canoeing, seriously, it may be professional but it is not a sport.
Practicing the sport
=Skateboarding became a professional sport in the late 1960's==Hope this helps you =p=
The same reason why any other sport became a professional sport: because people became very talented at it.
Nolan Ryan was associated with the sport of professional baseball.
There is Baseball & Soccer
You need to have a college degree to get a job.Then,you need to have a career to become a professional baseball player.
Learn the sport and practice more.
Ice Hockey became a professional sport in 1904. The United States formed the first professional league. Canada followed quickly in 1905.
They play professional baseball.
The game of basketball has become a very professional sport
The earliest definite reference is dated 1598