SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/tennis-ball-on-line-is-in

A ball lands touching the edge of the line. Is it in or out?

In. A ball touching a line counts as touching the court.

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  1. Out
  2. In ✔
  3. It is replayed

Why: If a ball touches any part of a line, it is treated as landing in the court that line borders. Even a tiny touch of the line is in.

Huh, didn't know that: Court measurements go to the outside of the lines, so the lines themselves are part of the court.

The dad joke
Why did the tennis ball love the line? Because touching it meant it was in.
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References

Answer: In. If a ball touches any part of a line, it is treated as landing in the court that line borders. Even a tiny touch of the line is in.

  1. ITF 2026 Rules of Tennis, Rule 12 Ball Touches a Line www.itftennis.com/media/7221/2026-rules-of-tennis-english.pdf
    If a ball touches a line, it is regarded as touching the court bounded by that line.
    Checked 2026-10-12.

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Test yourself in the game

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