In high school, Greg was a three-sport star, but excelled in basketball under future SCIBCA Hall of Fame coach, Ollie Butler.

[2] Greg was a Second Team All-Southern California "AA" Basketball selection in 1966 earning him a scholarship to Eastern New Mexico University.

[9] His brother, Jerry Hyder, finished his college career at Eastern New Mexico University as the 7th leading scorer in school's history with 1,316 points and currently stands 10th all time.

Against the Milwaukee Bucks and Kareem Abdul-Jabbar on January 15, 1971, Greg scored a career high 17 points against the eventual NBA champions.

On February 15, 1971, against the Wilt Chamberlain led Los Angeles Lakers, Greg scored 16 points in front of a large crowd that traveled via bus from Victorville, California, to watch the former high school star.