How do four badminton players draw lots in singles?

It depends on whether you play knockout or round robin. If you play knockout, draw lots directly. A-B, C-D, the winner will compete for the championship and the loser will compete for the third place. If it is a round robin game, that is, each player will play against the other three teams once, the order of the game can be arranged by rotation. The specific rules can be found in the encyclopedia, namely A-D, B-C, A-C, D-B, A-B and C-D, so that you can rank. When the results are the same, you can consider the small score and the goal difference, or let the top two play again.