Former world number one Caroline Wozniacki says she was "shocked" to be diagnosed with rheumatoid arthritis, but wants to become a role model for people with the condition.
The Dane, 28, discovered she had the auto-immune disease in August and says "it has been a lot to take in".
Rheumatoid arthritis causes pain, swelling and stiffness in the joints.
"You feel like you're the fittest athlete out there and all of a sudden you have this to work with," she said.
Wozniacki - who won the Australian Open in January, her only Grand Slam to date - revealed she had the condition after her season ended with defeat at the ATP Tour Finals.