Seattle SuperSonics (1994)
This remains one of the most legendary upsets in NBA history. It’s also arguably the moment that killed the SuperSonics franchise. Seattle entered the postseason as top seeds and most analysts favoured them to go all of the way. But they fell at the first hurdle against lowly No. 8 seed Denver.
Nobody saw this coming especially after the Sonics won the first two games of the series. But the Nuggets came roaring back and punished Seattle for failing to put them away. Dikembe Mutombo produced one of the sport’s most iconic images when he fell to the hardwood with the ball in his hands.