Monica Seles has never been one to back down from a challenge whether it was dominating the tennis court with her fierce two-handed strokes or overcoming unimaginable adversity in her career. But now, the 9-time Grand Slam champion is facing a battle that no trophy can fix.
At 51, Seles is dealing with health issues that are far more complex than anything she’s ever encountered in sport. And instead of quietly fighting through it in private, she’s choosing to open up, using her platform to raise awareness and inspire others who might be going through the same struggle.
During a recent interview, Seles shared her struggles with Myasthenia Gravis. She said, “I wish I had someone like me speak out about it and just raise awareness. It affects my day to day life quite a lot.”
Tennis legend Monica Seles opens up about being diagnosed with Myasthenia Gravis and how it’s affected her day-to-day life.
— TennisONE App (@TennisONEApp) August 12, 2025
Symptoms include weakness in the arm and leg muscles, double vision, fatigue, shortness of breath, difficulty speaking, and swallowing.
: SNTV/AP Photo pic.twitter.com/oAp2XVUJas
Seles shared that it all began during a casual tennis game with friends and family. She noticed she was missing shots she’d normally hit with ease, and at first, she chalked it up to being a little rusty.
But then something strange happened. She started seeing two balls coming at her instead of one. At first, she brushed it off, thinking it might just be a fluke. But when it kept happening more and more, she knew something wasn’t right. A trip to the doctor confirmed her fears she was diagnosed with Myasthenia Gravis.
Myasthenia Gravis is a rare chronic autoimmune disorder that basically messes with the way your nerves talk to your muscles. Normally, nerve signals tell your muscles when to move, but with this condition, that connection gets blocked, making muscles weak and tired way faster than they should.
The symptoms can vary, but common ones include droopy eyelids, double vision, trouble chewing or swallowing, slurred speech, and even weakness in your arms, legs, or neck. What’s tricky is that the weakness often gets worse the more you use those muscles and improves after resting. It doesn’t affect every muscle in the body, but it can definitely impact daily life from walking up stairs to just holding your head up if it’s a bad day.
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