Seeding is a system used to separate top players in a tournament to prevent them from meeting in the early rounds. The top seed is the player the tournament committee deems the best player - the ATP rankings and form in previous tourneys are the main factors considered to decide this. The organizers then place the top and second seed at opposite ends of the draw, meaning if they win all their matches, they will meet in the final round. The number of seeds depends on the size of the draw.