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The top five biggest upsets in NBA finals history are ranked. The 2014 finals had the San Antonio Spurs beating the Miami Heat 4-1. In 2019, the Toronto Raptors defeated the Golden State Warriors 4-2. The Milwaukee Bucks won against the Phoenix Suns 4-2 in the 2021 finals. The Dallas Mavericks beat the Miami Heat 4-2 in the 2011 finals. The biggest upset was the 2004 finals where the Detroit Pistons defeated the Los Angeles Lakers 4-1. We got the top five biggest upsets in NBA finals history. At number five we have the 2014 NBA finals where the San Antonio Spurs faced the Miami Heat and the Spurs won 4-1 in that series. At number four we have the 2019 NBA finals where the Golden State Warriors and Toronto Raptors ended up beating them 4-2. At number three we have the 2021 NBA finals where the Milwaukee Bucks beat the Phoenix Suns 4-2. At number two we have the 2011 NBA finals where the Dallas Mavericks played the Miami Heat and the Mavericks won 4-2 in that series. And at number one we got the 2004 NBA finals with the Pistons versus the Lakers where the Pistons won 4-1 in that series.