Grgurich served as the head coach at his alma mater, the University of Pittsburgh, for 5 seasons in the mid to late 1970s.
He arrived at UNLV in the mid-1980s, importing the amoeba defense developed when he was a Pitt assistant under Bob Timmons and Charles Ridl to Jerry Tarkanian's teams.
Grgurich finished with a record of 69–70, as his mostly undermanned teams were noted for playing with high energy, enthusiasm, and interesting defensive schemes.
Grgurich continued those defensive stratagems while serving as the top assistant coach at UNLV, culminating with winning the NCAA championship in 1990 over top-ranked Duke.
[1] Grgurich has served as an assistant coach for several NBA teams including extended stays with the Seattle SuperSonics under fellow Pittsburgher George Karl.