International Tennis Hall of Famer Monica Seles was diagnosed with myasthenia gravis three years ago, she revealed Tuesday.

Seles, 51, publicly discussed her diagnosis in an interview with The Associated Press . Myasthenia gravis is an autoimmune condition that affects how your nerves communicate with your muscles and causes muscle weakness that worsens throughout the day with activity, according to the Cleveland Clinic . Double vision and/or drooping eyelids are often the first symptom, per the Clinic.

“I would be playing with some kids or family members, and I would miss a ball. I was like, ‘Yeah, I see two balls.’ These are obviously symptoms that you can’t ignore,” Seles told AP. “And, for me, this is when this journey started. And it took me quite some time to really absorb it,

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