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Service Box.

Service box dimensions, marking rules, and strategy affect serve placement, court positioning, and match tactics in tennis.

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Court Dimensions ·11 min · May 2026

Service Boxes and Tennis Court Dimensions: Where the Standard Advice Holds Up, and Where It Breaks

The common advice goes like this: a tennis service box is 21 feet long by 13.5 feet wide, and there are four of them, two per side, split by the centre service line. Coaches repeat it.