Monica Seles first noticed the symptoms of myasthenia gravis — a neuromuscular autoimmune disease — while she was swinging a racket the way she’d done so many times.

Tennis Icon Monica Seles, 51, Reveals Health Struggle Fans Never Knew About originally appeared on Parade. Tennis champion Monica Seles, 51, has revealed a difficult medical condition she has been dealing with for some time. On August 12, The Associated Press shared details about Seles' journey with a condition called myasthenia gravis.

Tennis player Monica Seles shared that she was diagnosed with Myasthenia Gavis, a neuromuscular disease that causes muscle weakness, and detailed the symptoms that led to her seeking a doctor.