Nine-time Grand Slam champion Monica Seles is battling a new challenge: a neuromuscular autoimmune disease called myasthenia gravis.

The 51-year-old Seles is going public about the condition she was diagnosed with three years ago. It causes muscle weakness in the arms and legs and bouts of double vision among other symptoms.

Seles was noticing odd changes around five years ago and it eventually became apparent to her that something major was wrong.

“I would be playing (tennis) with some kids or family members, and I would miss a ball,” Seles said, according to The Guardian. “I was like, ‘Yeah, I see two balls.’ These are obviously symptoms that you can’t ignore.

“And, for me, this is when this journey started. And it took me quite some time to really absorb it, speak openly about it, b

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