Australia's Nick Kyrgios says he was in a "lonely, dark place" after suffering with depression while on tour.
The 25-year-old has not played since February after limiting his travel because of the coronavirus pandemic.
Kyrgios, who began to see a psychologist in 2018, said people were not aware how lonely tennis could be.
"I felt like no-one wanted to know me as a person, they just wanted to get a hold of me as a tennis player and use me," he told Sydney's Sunday Telegraph.
Kyrgios described an incident in Shanghai where he "didn't want to see the light of day".