Top 10 biggest upsets in NBA history

#5 Denver Nuggets VS Seatle Supersonics (1993-1994)

Denver Nuggets comeback from 2-0 down to win the series against the Seatle Supersonics

The Seatle Supersonics, behind Gary Payton and Shawn Kemp, put up a record of 69-19 during the regular season and grabbed the first seed in the Western Conference. As they entered the playoffs, they faced the 42-40 Denver Nuggets.The series started as expected as the Sonics took a commanding 2-0 lead in the series and looked like they would sweep the Nuggets easily.

But the young Nuggets team led by fourth-year guard Mahmoud Abdul-Rauf, third-year center Dikembe Mutombo and second-year forward LaPhonso Ellis rebounded two home victories and completely stunned the favourites in game 5 in Seattle, where George Karl’s Sonics had lost only 4 games all season.

LaPhonso Ellis' 16 points per game and Dikembe Mutombo's record 31 blocks in the series, led the way for the Nuggets comeback, and they became the first eighth-seeded team ever in NBA history to defeat a first seeded team.

Amazingly, Denver would go on to nearly pull off the same feat in the next round, falling behind 3-0 to Utah before winning three straight to force Game 7, where they were finally eliminated.