Nine-time Grand Slam champion and tennis Hall of Famer Monica Seles has revealed she has been living with myasthenia gravis, a rare neuromuscular autoimmune disease, for the past three years. The 51-year-old made the disclosure in August 2025, just days before the start of the U.S. Open, as part of a campaign to raise awareness of the condition. The announcement came through a series of interviews and public appearances linked to her partnership with pharmaceutical company argenx.
Seles said she chose to speak publicly now in the hope that sharing her experience will help others recognise symptoms early and seek treatment.
