Mandatory Events and the Logic of Ranking Defence
Tennis rankings work on a rolling basis. A result earns points that sit on a player's total for roughly a year and then expire, replaced by whatever that player does in the same week the following year. That design shapes almost every scheduling decision in the sport, because a player is never purely accumulating. They are constantly defending. Points drop off at the moment a tournament comes around again, so skipping an event where a player did well is not a neutral act of rest. It is a subtraction.
On top of that sits a tier of top-level tournaments that the tours designate as effectively compulsory for highly ranked players, with reduced entry privileges, forfeited points or other consequences attached to unexplained absence. A player trying to protect a seeding, qualify for the season-ending championship, or stay inside the group that receives direct entry into the majors is therefore not choosing freely from a menu of events. The ranking system converts what looks like a personal decision about rest into a defensive obligation, continuously rather than at a few decision points in the year.
