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 Scoring System Explained

Progressive shifts in the gut microbiome reflect prediabetes and diabetes development in a treatment-naive Mexican cohort

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

Strategy Optimization in Sports via Markov Decision Problems

2203.08489] Bayesian Analysis of Formula One Race Results: Disentangling Driver Skill and Constructor Advantage

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

A late-stage assembly checkpoint of the human mitochondrial ribosome large subunit

Sustainability, Free Full-Text

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

How to Read a Tennis Scoreboard - Mind the Racket

Tennis Scoring Simplified Point System + How To Keep Score