Professional tennis star Caroline Wozniacki has always prided herself as being one of the most fit athletes on the WTA tour. “I think that’s something I definitely win quite a few matches on,” she has said. Earlier this year, Wozniacki regained her status as the No. 1 female player in the world when she won the Australian Open, her first Grand Slam victory. But after being besieged by injuries and debilitating fatigue, she suspected something was wrong beyond the typical sprains and pains that come with being an elite athlete. She has since announced she has rheumatoid arthritis (RA), a chronic inflammatory disease of the joints. Here’s a look at how Wozniacki manages the rheumatic disease.