ITF Rules
🏛️Official — ITFThe Chair Umpire
Verdict
The chair umpire has overall responsibility for the conduct of the match and is the final authority on all matters of fact during play (ITF Rules of Tennis 2026, Appendix V). The chair umpire calls the score, calls lets, foot faults (when no line umpires are present), net cord, and all violations.
Source: Rule 30
Send this to your friend — argument over.
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