In mixed doubles, men's doubles and women's doubles, the rules are different from singles. * * * is divided into four groups, A-D and * * *, in which the No.1 seed and No.2 seed are placed in Group A and Group D respectively, and the No.3 and No.4 seeds are randomly placed in Group B and Group C, and the top two in each group get the right to qualify. After the teams qualify, eight pairs of qualifying players will be eliminated by drawing lots again. Among them, Group A and Group D are still in the upper and lower half 1 and No.8, Group B and Group C will draw lots to decide No.3 or No.6 in the upper and lower half, and Group A, Group B, Group C and Group D will immediately draw lots to decide No.2, No.4, No.5 and No.7.. After the lottery is completed, cross elimination will be implemented, and the winner will enter the semi-finals.