The ATP defines the ATP Entry Ranking as "the objective merit-based method used for determining qualification for entry and seeding in all Tournaments for both singles and doubles, except as modified for World Team Championship, World Doubles Championship and Tennis Masters Cup...The Entry Ranking period is the immediate past 52 weeks, except for: the Tennis Masters Cup, which is dropped on the Monday following the last ATP event of the following year; Futures Series Tournaments, that are only entered into the System on the second Monday following the Tournament's week. Once entered, all Tournaments, except for the Tennis Masters Cup, remain in the System for 52 consecutive weeks."