Basketball

come practice

Olymipcs

the first match was in 1904 this is when no professional athletes was able to compete in the Olympics.

League

In the US the professional league is called the NBA.

Tournament

In the US their are 18 NCAA teams that compete in a tournament
Cleveland Cavaliers vs Memphis Grizzlies - Full Game Highlights | March 25, 2015 | NBA 2014-15