On the basis of drawing lots, the organizers make appropriate interventions and adjustments. Generally speaking, the seed players will not be put in a group as far as possible, and athletes from the same country will not be put in a group. Of course, it depends on the decision of the organizer and the organization under its jurisdiction.
For example: 16 people take part in the competition, and ABCD four people are recognized as strong (according to previous competition results or world rankings), then the competition is divided into four regions, and ABCD is the seed player in one region respectively. The rest 12 people draw lots, 123 is in the same district as A, 456 is in the same district as B, and so on. The competition adopts the knockout stage. In the first group, everyone else couldn't beat A, and A became the top four after two games. B in the second group was eliminated by player 4, who defeated another player 5 in the next round. Then number 4 is the first in the second group, which is the top four. The next semi-final will be a-4. The other two are the same. Whoever wins will advance.