Novak Djokovic and Naomi Osaka (AP Photos)There was plenty of entertainment at Wimbledon on Monday beyond the tennis, as Novak Djokovic produced one of the most memorable off-court moments of the opening day by asking for an invitation to a fan's wedding after witnessing a marriage proposal from Centre Court.The heartwarming moment unfolded after Djokovic claimed the opening set of his first-round clash against China's Wu Yibing. During the changeover, a man in the crowd got down on one knee and proposed to his girlfriend, prompting cheers from spectators.The seven-time Wimbledon champion quickly noticed the emotional scene. As he returned to court, Djokovic flashed a heart gesture, gave the happy couple two thumbs up and shouted: "I want an invitation to the wedding."Watch the moment here:The light-hearted exchange drew loud applause from the Centre Court crowd and added another memorable chapter to Djokovic's long association with Wimbledon.If the couple does send an invitation, the Serbian may even have access to world-class entertainment. Puerto Rican superstar Bad Bunny was sitting in Djokovic's player box during the match, just two days after the tennis great made a surprise appearance during the rapper's concert in London.Djokovic then got down to business, defeating Wu 6-4, 5-7, 6-4, 6-4 under the closed roof as fading daylight forced the lights on. The victory improved his remarkable first-round record at Wimbledon to 21-0, keeping his bid for an eighth title firmly on track.Osaka turns heads with Kill Bill-inspired Wimbledon lookWhile Djokovic grabbed headlines with his interaction with fans, Naomi Osaka created another viral moment with a striking fashion statement before even hitting a ball.Watch her entrance here:Despite Wimbledon's famous all-white dress code, Osaka found a creative way to express herself by arriving on No. 3 Court wearing a flowing white kimono featuring elaborate embroidery and dramatic sleeves.The Japanese star's entrance immediately caught the attention of fans, many of whom lifted their phones to capture the moment, while one spectator shouted, "C'mon queen!"After easing past Elsa Jacquemot 6-1, 7-5, Osaka revealed the inspiration behind her outfit."My Japanese heritage means a lot. They say all white at Wimbledon and I thought it would be really cool to come out in a kimono," she said.Osaka added that the design was inspired by Quentin Tarantino's Kill Bill, particularly Lucy Liu's iconic character O-Ren Ishii in a white kimono."I like to be like a video game character sometimes. I don't want to be myself when I'm playing on the court. I kind of try to embody her a little," she explained.