The 51-year-old Seles, who won her first major trophy at age 16 at the 1990 French Open and played her last match in 2003, said she was diagnosed with myasthenia gravis three years ago and is speaking publicly about it for the first time ahead of the U.S. Open, which starts on Aug. 24, to raise awareness about what is known as MG.

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.

Former tennis star Monica Seles says she has been diagnosed with myasthenia gravis, a neuromuscular autoimmune disease.