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ASC 1990-1991: U.S. Open Cup
Home teams are listed first.

First Round (Play-in)
San Jose Earthquakes 2-0 Edmonton Brickmen
Fort Lauderdale Flight 3-3 San Diego Nomads (SD wins on penalties 4-3)
Chicago F.C. 3-1 Miami Sharks
F.C. Philadelphia 1776 2-3 Atlanta Chiefs (extra time)

Round of 16
Tampa Bay Rowdies 3-1 San Jose Earthquakes
Boston Bolts 2-0 San Diego Nomads
Seattle Sounders 3-1 Chicago F.C.
Vancouver Whitecaps 2-2 Atlanta Chiefs (VAN wins on penalties 4-2)
New Jersey Eagles 3-3 New York Cosmos (NY wins on penalties 3-1)
Toronto Blizzard 2-0 Minnesota Strikers
Washington Diplomats 2-4 Portland Timbers
Motor City F.C. 0-2 Los Angeles Heat

Quarterfinals
Vancouver 2-0 Seattle
Los Angeles 3-3 Tampa Bay (LA wins on penalties 4-2)
Boston 2-1 New York
Toronto 3-1 Portland

Semifinals
Los Angeles 0-4 Vancouver
Toronto 2-1 Boston

Final (Rose Bowl, Los Angeles)
Toronto 2-3 Vancouver

CHAMPIONS: Vancouver Whitecaps

The Vancouver Whitecaps won veteran manager Bob Gansler his first trophy of any kind by beating the Toronto Blizzard in a surprisingly all-Canadian U.S. Open Cup final. It will be Vancouver's last U.S. Open Cup as well, thanks to an outcry from American supporters who claimed that the Cup should be for American teams only. U.S. Soccer closed the exception allowing Canadian teams to participate immediately after the final. The Canadian clubs announced their own competition in 1991-1992.