Tennis legend Monica Seles is opening up about her journey with myasthenia gravis, a neuromuscular autoimmune disease she was diagnosed with three years ago.

In a recent interview with The Associated Press , Seles, 51, said she chose to share her diagnosis ahead of the U.S. Open later this month to raise awareness about the disease, also known as MG.

Myasthenia gravis affects about 20 out of every 100,000 people in the world, according to the Cleveland Clinic .

"The actual number may be higher, as some people with mild cases may not know they have the condition," the clinic notes. "In the United States, there are approximately 60,000 people affected by myasthenia gravis at any given time."

Seles, whose career included nine Grand Slam titles and a place in the International

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