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Tennis champion Monica Seles is speaking publicly for the first time about her battle with a rare, incurable muscle-weakening disease.

Myasthenia gravis (MG) is a chronic neuromuscular disease that causes weakness in "voluntary muscles," according to the National Institute of Neurological Disorders and Strokes.

Voluntary muscles are the ones that connect to the bones, face, throat and diaphragm. They contract to move the arms and legs and are essential for breathing , swallowing and facial movements.

‘GREY’S ANATOMY’ STAR DIAGNOSED WITH AUTOIMMUNE DISEASE AFTER ALARMING SYMPTOMS

"My MG journey over the past five years has not been an easy one," Seles said in a press release announcing her collaboration with the immunol

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