To win the deciding match

How to understand the expression “to win the deciding match”?

What is the definition of “to win the deciding match” in tennis?

In tennis, to win the deciding match means to win the entire tennis contest. Matches are usually played as best of five or three sets and the call ‘game, set and match’ is made when a player is victorious.

Lyon – Nantes
Football. France - Ligue 1
Bologna – Parma
Football. Italy - Serie A
Lazio – Empoli
Football. Italy - Serie A
Alaves – Barcelona
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Dynamo Kyiv – Kryvbas
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Brighton & Hove – Tottenham Hotspur
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Nice – PSG
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Farjestad – Ocelari Trinec
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A. Beterbiev – D. Bivol
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S. Nikolson – R. Chapman
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F. Wardley – F. Clarke
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C. Eubank Jr. – K. Szeremeta
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J. Opetaia – J. Massey
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B. Royval – T. Taira
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J. Nakatani – T. Salapat
Boxing. WBC Title