 Djokovic had surgery less than a month ago to repair a torn meniscus in his right knee. He was injured in the French Open June 3rd. His first round match is scheduled for Tuesday. Djokovic has won seven of his 24 Grand Slam titles at Wimbledon. Also part of the excitement this year will Princess of Wales Kate Middleton attend the event as she continues her recovery. As patron of the event, she's traditionally presented the winner's trophy. I'm Louise Schiavone, NPR News, Washington.