Rollerball (1975)

Rollerball is a 1975 science fiction sports film directed and produced by Norman Jewison. It stars James Caan, John Houseman, Maud Adams, John Beck, Moses Gunn and Ralph Richardson. The screenplay, written by William Harrison, adapted his own short story, "Roller Ball Murder", which had first appeared in the September 1973 issue of Esquire.
https://en.wikipedia.org/wiki/Rollerball_(1975_film)
Rollerball is another of those great 70's cult sci-fi films. It features a great cast of actors and a smart script. It was notorious at the time for its violence, although that was greatly exaggerated in comparison to some professional sports and entertainment. It features a futuristic reimagining of the Roman Empire, with gladiatorial games to distract the populace from their bleak existence. It also predates cyberpunk literature, with ts depiction of a world controlled by powerful conglomerates, a world not too different from the present one.

James Caan is fantastic as Johnathan E, the Michael Jordan of Rollerball. He continues to succeed in a sport designed to show the futility of individual effort. The sport is constantly changed to stop him, yet he continues to overcome every obstacle.
http://www.imdb.com/title/tt0073631/reviews?ref_=tt_urv