Taylor Swift is one of her generation's most popular stars. However, the world's top tennis player doesn't know who she is. Jannik Sinner mentioned this after his Friday match (July 5). A reporter asked Sinner what music he had listened to before the matches and if he knew any of Swift’s songs.  After saying he likes rock, Sinner said he "doesn't know" Swift. “Yes, I do. I listen to rock," said Sinner. "Sorry, but I don’t know who Taylor Swift is." Sinner learned Swift is a music star from the reporter. He said, "No idea." Ironically, Sinner has appeared at dinner with Swift's ex-boyfriend, Joe Alwyn. The Daily Mail reported they were at Mayfair's Mount St. Restaurant. Why do you think Sinner said he didn’t know who Taylor Swift was?