Roger Federer's twin sons, Leo and Lenny, were spotted at the Shanghai Masters on Wednesday without their famous father. The boys attended the fourth-round clash between Daniil Medvedev and Learner Tien.A video of the 11-year-olds, who know a thing or two about the sport, having grown up watching their legendary father, was posted on X by Tennis TV. While they were in the stadium without their father, they certainly didn't make the trip to Shanghai without him. Federer is also in town and is set to headline a celebrity doubles match on Friday. Despite retiring from the sport three years ago, the Swiss ace has made the trip to Shanghai every year.Federer and the Shanghai Masters share a common sponsor, Rolex. The Swiss won the tournament twice, capturing his first title in 2014 and his second during his resurgent 2017 season. He remains a massive draw even after hanging up his racquet for good. His upcoming doubles event features some of the most well-known names in China.Roger Federer's 'Roger & Friends' event at the Shanghai Masters to rope in Donnie Yen, Wu Lei & Zheng JieRoger Federer (middle) at the Laver Cup 2025. (Photo: Getty)Roger Federer has pulled in some of the biggest names in China to entertain fans with his 'Roger & Friends' celebrity doubles match at the Shanghai Masters. The 20-time Major champion will be joined by former tennis pro Zheng Jie, who was a trailblazer for Chinese tennis.Zheng was the first player from China to reach a Major semifinal in singles, achieving this feat at Wimbledon in 2008. She made the last four once again at the Australian Open in 2010. She also won a couple of Major titles in doubles.Federer and Zheng will be joined by two prominent names from the entertainment industry. The iconic Donnie Yen, whose career has spanned over four decades, will be a part of the festivities. Best known for his performances in the Ip Man series and other action flicks, he is a legend in the movie business. Completing the line-up is Wu Lei. The 25-year-old actor has captured the attention of his country's audience and has quickly become a major star. 'Roger & Friends' will take place on Friday.