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?

Why is Percentage of Total Break Points Converted used as a tennis stat?

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rules - What does this number mean in PGA Tournament scores? - Sports Stack Exchange

Designation and Control of Landing Points for Competitive Robotic Table Tennis - Jing Li, Xiaopeng Chen, Qiang Huang, Xuechao Chen, Zhangguo Yu, Yingxian Duo, 2015

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The Tennis Organizer ~ Best Tennis Score Book & Score Sheet Charting!

Probability and Tennis