How to draw lots for doubles?

Does it mean that nine people play a singles game and a doubles game, and they are all champions?

In singles, nine people can draw lots and divide into three groups (if there are seeded players), play round robin, record the score of each game, and then the first person in the small group will qualify, and the three people who qualify will play round robin again, and reserve the third place according to the outcome and score.

It's a little difficult for nine people to play doubles, because how to divide into groups, and there is a feasible suggestion I can think of later. Every three people are divided into three teams. During the competition, the team will play. Every two teams play three doubles games, no matter how the first two teams win or lose, they have to play three full games. The appearance order of the three games will be decided by the team itself, and the appearance order will be handed over to the referee before the game, and the games will be played in order. After all competitions, the first and second teams will be divided according to the outcome and scores.

I hope it helps you.