As enjoyable and memorable as the NBA postseason can be, it rarely produces significant surprises.

Sure, an occasional first-round upset stands out – like MVP Dirk Nowitzki and the top-seeded Dallas Mavericks falling to the Golden State Warriors in 2007 – but almost never does an underdog hoist the Larry O'Brien Trophy as season's end.

Of course, that depends on your definition of an underdog.

In each of the last 25 seasons – and in 49 of the last 51 – the team that won the NBA Finals was a top three seed in their conference. The only exception to that rule since 1970 is the 1995 Houston Rockets, who finished sixth in the Western Conference despite being the reigning NBA champions.

The 2020-21 NBA season has already been an unprecedented one, with games played in empty arenas and players being held out of games due to league virus safety protocols. And why should the oddities end when the playoffs begin?

From 2015-18, the Warriors played the Cleveland Cavaliers in the Finals four straight seasons, making everything beforehand feel like a waste of time. The pattern was broken in 2019 because LeBron James switched conferences, but the Warriors represented the west for the fifth straight season. Last season, James played in the Finals for the ninth time in 10 campaigns, leading the Los Angeles Lakers to a title.

This season, however, is suspiciously devoid of a juggernaut. The top regular season teams are unproven in the playoffs, and the typical postseason performers must answer serious questions and navigate a difficult road to the Finals.

The Utah Jazz had the league's best record this season at 52-20, a .722 win percentage. That is the fifth-worst record by a league-leading team since the NBA-ABA merger and the worst in 20 years.

Lowest Win Pct by Team With NBA's Best Record in Season, Since 1976-77

SEASON     TEAM                      WL        PCT

1976-77    Los Angeles Lakers         53-29      .646

1978-79    Washington Bullets         54-28      .659

1977-78    Portland Trail Blazers     58-24      .707

2000-01    San Antonio Spurs          58-24      .707

2020-21    Utah Jazz                  52-20      .722

With just 10 wins separating the top-seeded Jazz and seventh-seeded Lakers, the west could deviate from seeding by quite a bit.

Even in the often-predictable east, the Miami Heat and Boston Celtics were considered preseason favorites in the conference, only to finish with the sixth and seventh seeds.

The fact is that whoever wins their conference to play in the NBA Finals – and ultimately raises the Larry O'Brien Trophy – will have a unique story about their road there. Whether it is a team who are a proven commodity that flipped the switch after a sub-par regular season or a high-seeded team that overcame past postseason failures, the 2021 NBA champions – like the 2020-21 regular season itself – will be unlike any other.

Honourable Mentions: West number one Dallas Mavericks, West number six Portland Trail Blazers

Both teams lack the depth to make a serious championship run but have enough star power in the backcourt to scare any opponent.

Dallas will face the Los Angeles Clippers in the first round and took two of three games this season against Los Angeles. Luka Doncic averaged 30.3 points, 8.3 rebounds and 11.0 assists in those games. In nine career games against the Clippers, Doncic is attempting 9.9 free throws per game, his most against any Western Conference opponent.

The Blazers will go exactly as far as Damian Lillard takes them. When Portland made their run to the Western Conference Finals in 2019, the Blazers were 7-0 when Lillard had a plus-minus above zero and were 1-8 when he had a negative plus-minus.

The 'Not Your Year' Tier: West number three Denver Nuggets

The season-ending knee injury to Nuggets star guard Jamal Murray was a devastating blow to Denver's title chances and takes some fun out of a special season by Nikola Jokic.

Although Murray's injury solidified Jokic as the MVP favourite – leading the Nuggets to a 13-5 record since the injury – it is hard to envision Denver making a deep run without their star guard.

The knock on Jokic has been that he would generally rather pass than score, and Denver are 5-8 in postseason games when Jokic attempts 20 or more shots.

With Jokic scoring a career-high 26.4 points per game this season and with the continued blossoming of Michael Porter Jr., however, the Nuggets remain dangerous in the playoffs.

The 'Prove It' Tier: West number four Los Angeles Clippers, East number one Philadelphia 76ers, West number one Utah Jazz, East number three Milwaukee Bucks, West number two Phoenix Suns

On paper, each of these teams appear to be solid championship contenders, complete with star power and coming off an impressive regular season.

But each of these teams need to prove they can take another step forward, either because of a limited postseason history or a checkered one.

At the start of last year's playoffs, the Clippers were considered by many to be the favourites but blowing a 3-1 series lead in the second round to the Nuggets was a humbling experience. Kawhi Leonard and Paul George have quietly had fantastic seasons, each averaging at least 23 points, six rebounds and five assists.

The 76ers and Bucks have been mainstays in the east playoffs for the past few seasons and are hoping that this year's vintage has the answers to take the next step.

Philadelphia, under new leadership with Doc Rivers and buoyed by the shooting of Danny Green and Seth Curry, have a scoring differential of plus-16.4 points per 100 possessions when Joel Embiid and Ben Simmons are on the court together, the best mark in the history of the much-maligned duo.

Milwaukee won 11 of their last 15 games, including two wins each against Philadelphia and the Brooklyn Nets – the two teams seeded higher in the east.

A machine over the last few regular seasons, the Bucks have faltered in past playoff series as Giannis Antetokounmpo failed to score in the clutch and his team-mates shrank from the moment. The costly acquisition of Jrue Holiday should help take some of the pressure off, and Antetokounmpo is shooting 73.3 percent (11 of 15) this season in the last two minutes of a game within five points.

Utah and Phoenix are fascinating prospects after stellar regular seasons but the consensus regarding both teams is that they have already maxed out their talent before the postseason starts.

Rudy Gobert is an All-Defensive Team mainstay for good reason, but Utah have been forced to sit him in the playoffs against smaller teams or when his free-throw shooting becomes a problem.

The Jazz are expecting leading scorer Donovan Mitchell to return from a sprained right ankle, but Utah are better operating as a five-man offense than a one-man show. When Mitchell attempts 20 or fewer field goals this season, the Jazz are 27-2. When he shoots more than 20 times, the Jazz are 12-12.

The Suns are 59-21 over their last 80 games, including in last year's bubble, and have become one of the best stories in the league. Chris Paul turns every team he is on into a winner, and he has a case to receive MVP votes scoring a modest 16.4 points per game.

For all of his career accomplishments, however, Paul has famously only advanced past the second round once in his career, and he now leads a core group of Devin Booker, Deandre Ayton and Mikal Bridges that lacks playoff experience.

The 'Sleeping Giant' Tier: East number six Miami Heat, West number seven Los Angeles Lakers

Last year's finalists have endured brutal regular seasons filled with disappointment, injuries and COVID-19 protocols.

Only Duncan Robinson played all 72 games this season for Miami, and while the Heat are healthier now than during their nightmare 11-17 start, serious questions remain about the health of veterans Jimmy Butler and Goran Dragic, who both missed at least 20 games this season.

The Lakers remain the betting favourites coming out of the west, despite needing a 103-100 play-in win over the Golden State Warriors to clinch a playoff berth. LeBron James and Anthony Davis missed a combined 63 games this season, and the duo only played together in 27 games.

While the health of the Lakers' superstars remains a concern, Los Angeles were 19-8 when both James and Davis played. The defending champions had a scoring differential of plus-11.4 points per 100 possession when the duo were on the court together. For as long as James and Davis are playing, the Lakers remain a juggernaut.

The Favourites: East number two Brooklyn Nets

Kevin Durant, James Harden and Kyrie Irving.

The Nets are the first team to ever have three players average at least 24 points (minimum 35 games). Durant, Harden and Irving are the highest-scoring trio since the early 1960s, when Wilt Chamberlain and Elgin Baylor were producing some of the best seasons in league history.

What makes Brooklyn such a strong contender, however, is that the supporting cast around their dynamic trio is a real asset.

The Nets' reserves scored 35.9 points per game this season, better than the bench of fellow contenders like the Bucks, Trail Blazers, Heat and Nuggets.

First-year head coach Steve Nash has consistently been able to field a competitive squad during a tumultuous year. As evidence of the change and adversity the Nets faced this season, they have used 38 different starting line-ups – only the lowly Rockets used more.

With veteran big men like DeAndre Jordan and Blake Griffin, the Nets can counter size but are also versatile enough to play small, with Jeff Green defending opposing centers.

The high-profile names make Brooklyn feel like an inevitability, but there is still plenty of uncertainty with this newly constructed super-team.

Durant, Harden and Irving have only played 202 minutes together, less than six percent of Brooklyn's season. The trio appear to blend well, scoring a torrid 117.8 points per 100 possessions, but any group of stars will face challenges in their first playoff test.