Former world number one Caroline Wozniacki has revealed a shock rheumatoid arthritis diagnosis.
The Dane, 28, discovered she had the auto-immune disease in August and says she want to become a role model for people with the condition.
Rheumatoid arthritis causes pain, swelling and stiffness in the joints.
She said she began to notice symptoms of fatigue after Wimbledon, where she lost in the second round, and one morning was unable to lift her arms over her head.
The world number three says some days she has struggled to get out of bed and doctors diagnosed her in August before the US Open.
Wozniacki, who won the China Open earlier this month, said: "You feel like you're the fittest athlete out there and all of a sudden you have this to work with.
"In the beginning, it was a shock. It's obviously not ideal for anybody, and I think when you're a professional athlete, it's also not even more ideal.
"I think I didn't want to talk about it during the year because I don't want to give anyone the edge or thinking that I'm not feeling well, but I have been feeling well.
"You learn how to just cope after matches. Some days you wake up and you can't get out of bed and you just have to know that's how it is, but other days you live and you're fine. You don't even feel like you have it."
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