David Gene "The Cobra" Parker (born June 9, 1951) is an American former player in Major League Baseball. He was the 1978 National League MVP and a two-time batting champion. Parker was the first professional athlete to earn an average of one million dollars per year, having signed a 5-year, $5 million contract in January 1979. http://en.wikipedia.org/wiki/Dave_Parker
excuse the edit, from '50's to must have been later
Edit 2: just because there seems to be dispute as to who was the first professional athlete to get a million a year ..
Catfish Hunter: Sports’ First Million-Dollar-a-Year Man .. one bit ..
However, in the early and mid 20th century, pro athletes were often not the visibly wealthy magnates they are today. The best players could earn comfortable livings, but the average or marginal players usually supplemented their incomes with offseason jobs. All of that changed with the advent of free agency, sports marketing, sponsorships, players’ unions and a sports pioneer: Jim “Catfish” Hunter.
Technically, major league pitcher Hunter is the first athlete in a major sport to earn at least $1 million in a season as part of his salary. (He wasn’t, however, the first athlete to sign a multimillion-dollar contract; that distinction belongs to hockey player Bobby Hull in 1972, who signed a 10-year deal worth $2.5 million. Hunter also wasn’t the first to average $1 million a year over the course of a contract.)
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