 Riegel was the low amateur (T13) in the 1948 Masters Tournament

Riegel turned professional in 1950 and played in 11 straight Masters Tournaments from 1947 to 1957.In the 1951 Masters Tournament, he was tied with Sam Snead after three rounds and finished second to Ben Hogan by two strokes.Riegel finished second to Ted Kroll in the 1952 Insurance City Open.