statistics - What does the superscript used in tennis scores mean

In the score below, what do the 7 and 4 superscripts mean in the first set?

Tennis set betting odds and statistics

When reading tennis scores, what does it mean when there's sometimes a superscript about the number of games won in a set? - Quora

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What does the superscript signify in a tennis scorecard? - Quora

officiating - What is the importance of the game scoresheet? - Sports Stack Exchange

An Introduction to Statistical Inference and Its Applications.pdf

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Tennis Statistics

Randomization and serial dependence in professional tennis matches: Do strategic considerations, player rankings and match characteristics matter?, Judgment and Decision Making

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Solved At a tennis tournament a statistician keeps track of