More than half of the teams in the league make it to the NBA playoffs every year, so perhaps it's not surprising that it's a rarity to see anything dramatic take place in the first round.
But something unexpected does happen occasionally, and when it does -- like the eighth-seeded Warriors knocking off the top-seeded Mavericks back in 2007-- it's usually spectacular.
Here are the 10 biggest first-round upsets of the past 10 years.
2016: Blazers (5) beat Clippers (4)
This one is more about an overachieving Blazers team than it is about a playoff upset, but a five-seed beating a four-seed technically qualifies, and we've got to start somewhere.
No one believed Portland had a shot at even making the playoffs in 2016, much less advancing to the second round. The latter became a much easier task once both Blake Griffin and Chris Paul were lost in Game 4 with season-ending injuries, but Damian Lillard and C.J. McCollum had the series tied at two games apiece even before L.A. lost its two biggest stars.
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2007: Bulls (5) beat Heat (4)
Just one season removed from winning the title, injuries to Dwyane Wade, Shaquille O'Neal and others derailed Miami's chances of repeating as champions.
Those two were back for the playoffs, but the team was a shell of what it was the year before, and Luol Deng and Ben Gordon each averaged more than 25.5 points per game during what was a relatively easy four-game sweep for the Bulls.
2012: Sixers (8) beat Bulls (1)
An eight-seed beating a one-seed should rank higher on any compilation of playoff upsets, but there are a couple of facts associated with this one that knock it further down our list.
First, the 2012 regular season was shortened to 66 games because of a lockout, which added at least a slight layer of awkwardness to this particular campaign. But what really turned this series in Philly's favor was an injury to Derrick Rose in Game 1 that kept him out of action the rest of the way. A fun Sixers team led by Jrue Holiday, Lou Williams and Andre Iguodala took control with three straight wins immediately after Rose was lost.
2007: Nets (6) beat Raptors (3)
Vince Carter is still playing in the playoffs for the Grizzlies at 40 years old, 10 years after he last made the All-Star team in 2007. And as the best player on the New Jersey Nets that year, he led his sixth-seeded team to a first-round upset of the Raptors.
That Toronto team was led by an All-Star version of Chris Bosh, long before he teamed up with LeBron James and Dwyane Wade in Miami to win two titles with the Heat. Bosh never made it past the first round in any of his seven seasons with the Raptors.
2009: Mavericks (6) beat Spurs (3)
Anytime the Spurs lose in the first round of the playoffs, it qualifies as an upset. This particular San Antonio squad won 54 games during the regular season with Tony Parker as its leading scorer, but had a tough time replacing Manu Ginobili's 15.5 points per game off the bench once he was lost for the season with an ankle injury.
2013: Warriors (6) beat Nuggets (3)
This one's just plain weird, mainly because of who one of Denver's key players was at the time.
Andre Iguodala played only one season with the Nuggets, and it happened to end with a loss in the playoffs to the team he'd join next. This was the first year that Stephen Curry, Klay Thompson and Draymond Green would experience the postseason, and they took down the Nuggets in six after Denver won 57 games during the regular season.
Iguodala would join the Warriors the very next season, and would be named Finals MVP of their championship team in 2015.
2014: Nets (6) beat Raptors (3)
Before the Nets' trade to acquire Paul Pierce and Kevin Garnett sunk the franchise to its lowest depths, there was a brief period of optimism. Ownership wanted to make a splash in Brooklyn during the team's first season in a new arena, and the Nets delivered by upending the third-seeded Raptors in the playoffs despite winning just 44 games during the regular season. Pierce was third on the team in scoring during the series, and KG gave all he could on the defensive end of the floor for 20 minutes a night.
NBAE/Getty ImagesSteve Babineau
2010: Spurs (7) beat Mavericks (2)
It only took one year for Gregg Popovich to exact his revenge on the Mavericks for the way his season ended in 2009. The tables were turned in 2010, with San Antonio entering the playoffs as a seven-seed and Dallas coming off of a 55-win regular season.
Manu Ginobili led the way by averaging 19 points per game after missing the playoffs the year before with an ankle injury, and Dirk Nowitzki's incredible series -- one in which he averaged 26.7 points per game while shooting better than 57 percent from three-point distance -- ultimately went to waste.
Getty ImagesAndy Lyons
2011: Grizzlies (8) beat Spurs (1)
This one was huge, despite the fact that it's widely-believed that the head coach of the Grizzlies at the time, Lionel Hollins, intentionally tanked the last couple of games during the regular season because he wanted this matchup with San Antonio.
Memphis had never won a playoff series in its franchise history before taking down the top-seeded Spurs, and had never won a single game in the postseason at home before this series. But an inspired defensive effort, along with both Zach Randolph and Marc Gasol shooting better than 50 percent from the field, helped the Grizzlies make history.
2007: Warriors (8) beat Mavericks (1)
Dirk Nowitzki won MVP in 2007 by leading his Mavericks to 67 wins during the regular season, but after reaching the NBA Finals the year before, Dallas was shocked by the eight-seeded Warriors in a first-round loss.
Baron Davis and Stephen Jackson led the way for that Golden State squad, and the Warriors ended the series with a 25-point home win in Game 6 to close the Mavericks out.