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?

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

Probability and Tennis

PDF] A comparison of the upper limb movement kinematics utilized by children playing virtual and real table tennis.

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

Linda_Herkenhoff,_John_Fogli_(auth.)]_Applied_Sta(BookZZ.org)

Interprofessional Inconsistencies in the Diagnosis of Shoulder Instability: Survey Results of Physicians and Rehabilitation Providers

How to Understand Tennis Scores - SportsRec

Alternative splicing modulation by G-quadruplexes