Tennis great Monica Seles is banking on a miracle after revealing that she's been diagnosed with a rare and incurable nerve disease that makes it difficult for her to move her arms and legs and could even block her breathing, RadarOnline.com can reveal.

In a tragic development, the nine-time Grand Slam singles champ, now 51, revealed she is suffering from myasthenia gravis – in which the body's immune system interferes with communication between muscles and nerves, making it difficult to swallow, speak, use the upper arms and legs, and, chillingly, freeze the respiratory system, sources said. Article continues below advertisement

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