Emma Raducanu first met Leylah Fernandez at a tournament for players 12 and under, around the time one of Fernandez’s teachers urged her to give up the tennis dream. “I just think that the matchup and what we’re seeing — those two ladies are touching a lot of young girls,” said Jorge Fernandez, Leylah’s father and coach. People will be watching in Asia: The 18-year-old Raducanu’s mother is from China and the 19-year-old Fernandez’s is Filipino Canadian.