 So far. With eight-time Wimbledon champ Roger Federer looking on, American Ben Shelton dropped the first set to Canadian Denis Shapovalov, but he's won the second and third sets. Hyattsville's Francis Tiafoe, though, he fell in five sets to Carlos Alcarez in their third-round match on center court. Tiafoe also lost a five-setter to Alcarez in the semifinals at the U.S. Open two years ago.