There can't be the "first" Basketball player to play in the NBA or other leagues because basketball is a "team sport." But there are teams that are the first like Boston Celtics, and many others Check out this link it may be helpful http://en.wikipedia.org/wiki/Basketball.
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check out this website :)
http://nbahoopsonline.com/Articles/History1.html
Toronto Huskies
There were many "First" people to play, i can tell you the first MVP...
Bob Pettit in 1956