Tennis Terms to Know. ACE – A ball that is served so well the opponent cannot touch it with their racquet. AD – Short for Advantage. It is the point scored after Deuce. If the serving side scores, it is Ad-in. If the receiving side scores, it is Ad-out. ALL – An even score. 30-30 is, for example, 30-all. 3-3 would be 3-all.
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