There is no umpire in tennis.
you need good arithmatic & art to be a tennis umpire.
Tennis starts when the umpire says and ends when the umpire says and when the sat lady sings
An Umpire :)
The chief umpire calls the final decisions on in, out, etc.
Two players and an umpire are the main positions of tennis.
The Chair Umpire may have up to ten assistants also called Line Umpires in tennis games.
The tennis match could not continue because the umpire was sick