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Tennis legend Monica Seles defeated some of the biggest names in the game in the 1990s and early 2000s.

Now, she’s facing a new kind of challenge.

The nine-time Grand Slam winner revealed today that she’s battling an incurable autoimmune disease.

Monica Seles reveals battle with myasthenia gravis

In a new interview with the Associated Press , Seles, 51, revealed that she’s been diagnosed with myasthenia gravis (MG) — a neuromuscular autoimmune illness with no known cure.

“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,” Seles told the outlet.

“I would be playing with some kids or family members, and I would miss a ball. I was like, ‘Yeah, I see two balls.’ Th

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