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The Guardian - UK
The Guardian - UK
Lifestyle

How does the umpire know which ball mark to check in clay court tennis?

Are you sure? … Rafael Nadal discusses a mark with the umpire at the Madrid Open
Are you sure? Rafael Nadal discusses a mark with the umpire at the Madrid Open. Photograph: Andrea Comas/Reuters

It’s clay court season in the tennis and as usual I’m puzzled. How does the umpire know which ball mark to check when a line call is disputed? There are hundreds of them …

Anna Tomkins, Leeds

• Post your answers – and new questions – below or email them to nq@theguardian.com. Please include name, address and phone number.

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