Ideally, if there are no unexpected results, 1 seed will play against No.8 seed, No.2 against No.7, No.3 against No.6 and No.4 against No.5 in the quarterfinals. But in many competitions, it is not so strict. For example, in most tennis matches, seeds 1 and No.2 are divided into two zones, and then seeds No.3 and No.4 are randomly assigned to these two zones, and seeds No.5 to No.8 are also randomly assigned. This may cause players in one region to be better than players in other regions. Considering that there are only 32 seeded players in the tennis Grand Slam, it is likely that the 33rd player and the 1 player will meet in the first round when the 128 player plays. This arrangement seems unreasonable, but considering that the rankings of tennis players are determined by computers, generally speaking, the changes in rankings are relatively small, so they will not be arranged randomly, but all players will be arranged according to the rankings in a so-called fairer way, so there will be many repeated matches.
In some competitions, after each round or several rounds, the two sides will re-rank and let the highest ranked player compete with the lowest ranked player. Both the American Hockey League and the American Football League adopt this method, while the American Professional Basketball League (NBA) does not adopt the method of re-ranking. The rules of NBA are the winners of No.65438+No.0 and No.8, and the winners of No.4 and No.5 will play in the next round. This has led some teams to deliberately lose the game and occupy the sixth place when determining the fifth and sixth places in the regular season, so as to avoid meeting the seeds of 1 prematurely.