Break Point (noun) [ foo t fawlt ]
What is a foot fault in tennis?
A foot fault occurs when a server’s foot touches any part of the baseline, or the imaginary extension of the center mark. For a foot fault to be called, any part of the server’s foot must touch any part of the baseline during the serving motion. This is according to Rule 18 of the official ‘Rules of the Game.’
Servers are permitted to ‘slight’ movements of the feet during a serve, but no large movements that might gain them an unfair advantage. This could include running along the baseline to create a different angle.