Yahoo Sports reports: Novak Djokovic witnessed a marriage proposal in the crowd at Centre Court during his Wimbledon first-round match Monday and was quick to ask for an invitation to the wedding. After Djokovic won the first set against Wu Yibing of China, one man in the crowd took the opportunity to pop the question to his girlfriend. The seven-time Wimbledon champion clearly took notice, coming back out on court and making a heart gesture and then two thumbs up toward the couple before shouting out: “I want an invitation to the wedding.”