Margetic's professional career began in 1978 for
San Telmo from the Isla Maciel district of Avellaneda. He came to the
United States to play for the
Detroit Express in 1979 and then moved on to the
Chicago Sting in 1981, where he went on to win
NASL Soccer Bowls in 1981 and 1984. He was a first team all star in 1983, a second team selection in 1982 and 1984, and an honorable mention in 1981. While playing for the Sting he earned the nickname "Magic Man". Margetic played in 130
NASL games, scoring 42 goals and 59 assists for 143 points, which ranks him 34th all-time in the league. Margetic scored the last goal in the history of the NASL in the 82nd minute of game two of the
1984 Soccer Bowl series. After the end of the NASL, Margetic played six seasons in the
Major Indoor Soccer League for the Chicago Sting,
Kansas City Comets,
Cleveland Crunch and
Tacoma Stars, and nine seasons in the
National Professional Soccer League for the
Chicago Power and
Detroit Rockers. He also appeared briefly for
Borussia Dortmund in 1988–89. ==Coaching==