Tennis great Monica Seles is speaking out about her battle with myasthenia gravis, a rare autoimmune disease that weakens muscles. The 51-year-old, who won nine Grand Slam titles and was inducted into the International Tennis Hall of Fame,

Monica Seles has gone public for the first time about her myasthenia gravis diagnosis. The two-time U.S. Open winner says she was diagnosed with the rare disease in 2023.