On Dec. 17, he said, as he was awaiting his P.C.R. result, he attended a tennis event in Belgrade, the Serbian capital, where he presented awards to children. He said that his P.C.R. test did not come back positive until after that event.
“I felt obliged to go ahead and conduct the L’Equipe interview as I didn’t want to let the journalist down, but did ensure I socially distanced and wore a mask except when my photograph was taken,” Mr. Djokovic said.
“While I went home after the interview to isolate for the required period, on reflection, this was an error of judgment and I accept that I should have rescheduled this commitment,” he added.