McEnroe: Little things help
In the NFL, the quarterback is connected with the coach on the sideline. The coach, shielding his mouth with his play list, calls the play and, through the miracle of modern technology, it arrives in the ear of the quarterback.
This kind of control, in the game of tennis, is not possible. Coaches, sitting in the stands, must resort to hand signals or brief oral observations. Both of which could incur a penalty if the referee deems they cross the line.
In Davis Cup, ...
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