Reigning Australian Open champion Caroline Wozniacki was diagnosed with rheumatoid arthritis before the US Open, she revealed on Thursday.
At a press conference following her WTA Finals exit, which she suffered with a 5–7, 7–5, 6–3 loss to No. 7 Elina Svitolina in the final round of group play, Wozniacki told reporters she was diagnosed in August after talking to doctors after Montreal. Wozniacki began feeling fatigue after Wimledon and was unable to lift her arms over her head waking up one morning over the summer.
Rheumatoid arthritis is an autoimmune disease that causes fatigue and swelling of the joints.