NBA playoffs

The previous playoff format, in place for the 2004–05 and 2005–06 NBA playoffs, after the NBA was re-aligned into six divisions, created controversy during the 2005–06 season and playoffs and would be changed prior to the 2006–07 NBA season.[5]

Prior to 2005, NBA division champions were seeded higher than the other teams in their conference, regardless of their record. Prior to 2004, when the NBA was aligned into two conferences with two divisions each, the division champions were guaranteed the top two seeds. This meant that top two teams in a conference (by record) would be seeded either first and second (if they were in opposite divisions) or first and third (if they were in the same division). Because of the NBA playoffs' preset matchups in the second round, this meant that the top two teams in a conference could never meet until the conference finals, assuming they both made it to that round.

After the NBA realigned its two conferences into three divisions each, the seeding rules remained largely unchanged. The top three seeds would now be reserved for division champions. However, this meant that if the top two teams (by record) in a conference were in the same division, they would be seeded first and fourth. Assuming no first-round upsets, this raised the prospect that the top two teams in the conference would face each other in the conference semifinals, instead of the conference finals.

In the second year of this format, the 2005–06 NBA season, the two teams with the best records in the Western Conference, the San Antonio Spurs and Dallas Mavericks of the Southwest Division, did just that. The Mavericks had the second-best record in the Western Conference and the third-best record in the entire league, behind the Detroit Pistons and San Antonio. However, they were seeded fourth because they finished second in the Southwest behind the Spurs. This turn of events led to the playoff format being criticized by many. Besides the prospect of a team losing earlier in the playoffs than its regular-season record or seeding would suggest, critics claimed that it also created an unfair advantage for teams in the 2-7/3-6 half of the Western Conference playoff bracket, who could advance to the conference finals without playing either of the two best teams in the conference in an earlier round.

The Phoenix Suns, winners of the Pacific Division and possessors of the third best record, were seeded second, while the Denver Nuggets, winners of the Northwest Division and tied for only the seventh-best record in the conference, were seeded third.

The Memphis Grizzlies and Los Angeles Clippers met in the second-to-last game of the regular season, after the top four seeds had been clinched. The two teams were already determined to be the fifth and sixth seeds, respectively, and had only to determine which rank higher. The fifth seed would likely need to defeat the best two teams in the conference without home-court advantage to advance to the conference finals, as it would face fourth-seeded Dallas in the first round and likely face first-seeded San Antonio if it managed to defeat Dallas. The sixth seed would play third-seeded Denver in the first round, but would have home-court advantage (since the Grizzlies had the fourth-best record in the conference and the Clippers had the fifth-best), and would not have to face either San Antonio or Dallas until the conference finals at the earliest.

This led to speculation about whether the Grizzlies or the Clippers would have much commitment to winning their match-up in the second-to-last game of the season, since it was clearly most advantageous to lose the game in order to obtain the 6th seed. The Clippers eventually lost to Memphis without much evidence to support the speculation that the Clippers had lost intentionally.[6] In the first round of the playoffs, the Clippers defeated the Nuggets in five games, while Memphis was swept by Dallas. Ultimately, Dallas and San Antonio did meet in the second round, with Dallas winning in seven games and advancing all the way to the NBA finals.

• 1947: The playoffs were instituted with a three-stage tournament, similar to the Stanley Cup playoffs of the 1930s; the two first-place teams qualified directly to one semifinal where they played each other in a best-of-7 series. Teams finishing second & third qualified for the best-of-3 quarterfinals, where the two second-placed teams were paired in one quarterfinal, as were the two third-placed teams, and the two quarterfinal winners played each other in a best-of-three semifinal. The two semifinal winners played each other in the Basketball Association of America (BAA) best-of-7 final series.

There were no byes, or idle time, for the division champions – as there would be for higher-seeded playoff teams 1955–66 and 1975–83. All six 1947 participants played their first tournament games on Wednesday, April 2; in 1948 the two Eastern runners-up (E2, E3 in the figure) were idle for a few days only because there was a three-way Western tie to break. Both winners of the runners-up bracket, Philadelphia in 1947 and Baltimore in 1948, reached the final series having played fewer tournament games than their final opponents, Chicago in 1947 and Philadelphia in 1948, had played in the best-of-7 pairings of division champions. And both winners of the runners-up bracket won the final series. The "postseason" actually comprised 11 games played in a span of 21 days for the 1947 Chicago Stags and 13 games in 30 days for 1948 Philadelphia Warriors, the finalists who emerged from the pairing of division champions.[3]

• 1949: The playoffs were reorganized to match Eastern Division teams exclusively, and Western Division teams exclusively – in two halves of the bracket, so to speak. Thus the BAA tournament generated a playoff champion in each Division. (So did the NBA in each of three 1950 divisions, and so it has done in each half of the league since then.) The top four teams from each of the two divisions qualified. The quarterfinals and semifinals were renamed division semifinals and division finals, respectively, and both rounds were best-of-3. Thus any playoff team might be eliminated in two games, one home game. The best-of-7 final was unchanged.

• 1950: The BAA was renamed as the National Basketball Association (NBA). With a three-division setup, 12 teams now qualified for the playoffs, with the top four teams from each division meeting in the best-of-3 division semifinals. The winners met in the best-of-3 division finals. With three teams remaining, the surviving team with the best regular season record qualified directly for the finals while the other two teams met in a best-of-3 NBA semifinals.
• 1951: With the NBA reverting to a two-division setup; the division semifinals reverted to its original 1949 format with only eight teams qualifying. The division finals was extended to a best-of-5 format.

• 1954: With only nine league members (soon to be eight), the number of playoff teams was cut down to six. The division semifinals was changed to a double round-robin format within the division, with the top three teams from each division qualifying (each team played four games). Following the round-robin games, the top two teams qualified for the best-of-three division finals, followed by the best-of-seven finals.
• 1955: The number of playoff teams remained at six, but the initial round-robin was dropped after one year in favor of giving the first-place team in each division a bye to the best-of-five division finals. Teams which placed second and third played a best-of-three division semifinal. In 1955 the byes provided five and six extra days idle for the first-place teams.[7]
• 1958: The division finals was extended to a best-of-seven format.
• 1961: The division semifinals were extended to a best-of-five format.

The 1961 to 1966 tournaments alone combined initial byes for seeded teams with best-of-five initial series for unseeded teams. The 1961 byes provided five and seven extra days idle for the first-place teams. By 1966 the schedule provided more rest for the first-round participants with byes of 11 and eight extra days idle.[8]

• 1967: The number of playoff teams was expanded to eight once more. The division semifinals now included the fourth-best team in each conference. The first-placed teams no longer received a bye. They were matched against the fourth-placed teams in the best-of-5 division semifinals.
• 1968: The division semifinals was extended to a best-of-seven format.

• 1970: With an increased number of teams, the divisions were upgraded into conferences, which were then split into two divisions. Eight teams still qualified, four from each conference. The two division winners were guaranteed at least a #2 seed, and the two best non-division winners from each conference qualified as third and fourth seeds. Hence, the division semifinals and division finals came to be known as conference semifinals and conference finals, respectively.

• 1975: The number of playoff teams was expanded from eight to ten. A first round was introduced which matched the fourth and fifth seeds in each conference in a best-of-3 first round series, while the top three seeds received a bye. This is similar to the system currently used in the MLB.

• 1977: The number of playoff teams was expanded from 10 to 12. The first round now included the sixth best team in each conference, which was matched against the third seed. Only the division winners received byes to the next round.

The 1983 tournament is the latest to incorporate first-round byes for seeded teams. The first-round best-of-three series tapped off on Tuesday and Wednesday, April 19 and 20; the second-round best-of-sevens on Sunday to the following Wednesday, April 27. Counting from Tuesday the byes provided five to eight extra days idle.[9]

• 1984: The playoffs were expanded from 12 teams to 16 teams. All teams now participated in the first round, which was extended to a best-of-five series.

• 2003: The first round was extended to a best-of-seven series. This change arguably benefitted the higher seeds as it reduced the likelihood of an upset by a lower seed. It also meant that a team that swept their series 4–0 might have to wait up to two weeks to play their next series against a team that had won 4–3.

• 2005: Each conference was realigned into three divisions with each division winner qualifying for a top-three seed regardless of record. The next best five teams from each conference also qualify for the playoffs.

• 2007: To address the criticisms of having each division champion guaranteed a top-three seed, regardless of record, the rules were changed such that the division winners are now only guaranteed a top-four seed. The team with the second-best record in the conference is now guaranteed the second seed, even if it finishes second in its own division. This ensures that the two best teams in the conference will not meet until the conference finals at the earliest. The previous system raised the prospect of the two best teams in the conference being seeded 1 and 4 if they play in the same division, thus forcing them to play each other in the second round (given no upsets).
  • Note: In the example below, both the East's #2 seed and the West's #3 seed are not division champions.

• 2016: While the playoff bracketing did not change, qualification criteria were changed. The teams with the eight best records in each conference receive playoff berths, with no automatic berths nor guaranteed top-four seed placement for division champions.