Greer was the first to gain 2,000 yards receiving in a professional football season.

Greer first was picked by the Los Angeles Rams in the 1980 NFL Draft but before playing a single game signed with the Canadian Football League team Toronto Argonauts.

He was the MOP of the CFL East Division and was the first professional football receiver to gain 2,000 yards in a season, with 2,003.

Greer made his NFL debut with the Cleveland Browns in 1986, playing with the team for one season before being traded to the San Francisco 49ers.

In 1990, Greer made his last stand in his playing career with the Detroit Lions as he recorded 3 touchdowns before retiring.