Monica Seles first noticed the symptoms of myasthenia gravis — a neuromuscular autoimmune disease she discussed during a recent interview with The Associated Press — while she was swinging a racket the way she'd done so many times during, and after, a career that included nine Grand Slam titles and a place in the International Tennis Hall of Fame.

“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 said. “And, for me, this is when this journey started. And it took me quite some time to really absorb it, speak openly about it, because it’s a difficult one. It affects my day-to-day life quite a lot.”

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