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service zones 
Zones where the server and receiver must remain for a serve; once the serve is delivered, players can move all over the court.
doubles service court
Service zone used by a player for doubles matches; the doubles playing area measures 13.4 m x 6.1 m.
singles service court
Service zone used by a player for singles matches; the singles playing area measures 13.4 m x 5.18 m.
