Hall of Famer Seles revealed she’s been diagnosed with the neuromuscular disease myasthenia gravis.

There is no known cure for myasthenia gravis. The Mayo Clinic says myasthenia gravis “causes muscles under your voluntary control to feel weak and get tired quickly. This happens when the communication between nerves and muscles breaks down.

“Treatment can help with symptoms. These symptoms can include weakness of arm or leg muscles, double vision, drooping eyelids, and problems with speaking, chewing, swallowing and breathing.”

The 51-year-old Seles announced her battle with the disease today. Seles is a spokesperson for agenx “a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases.”

The nine-time Grand Slam champion is ambassador for agenx’s “Go for Greater” ad campaign designed to raise awareness and understanding for people diagnosed with myasthenia gravis.

“My MG journey over the past 5 years has not been an easy one,” Seles said. “I felt isolated and defeated as many of the activities I enjoyed were no longer physically possible for me. I’ve since realized that by sharing my story, I can raise awareness of this disease, empower patients to advocate for themselves and help them connect with the MG community for support.

“I am excited to partner with the argenx team – to inspire others living with MG to rally against this disease, pursue their goals, and live a fulfilling life. We’re all in this together.”

Known as one of the most devastating returners in Open Era history, Seles won 53 career titles, including back-to-back US Open championships in 1991-92. Seles inspired legions of pro players, including the young Venus Williams and Serena Williams. Seles, who played with two hands off both wings, held the world No. 1 ranking for 178 weeks and concluded her brilliant career with a 595-122 career record.