British teenager Emma Raducanu arrived in New York last month with a ranking of 150th, just one Grand Slam appearance to her name and a flight booked to head out of town after the U.S. Open’s preliminary rounds in case she failed to win her way into the main tournament. “The future of women’s tennis, and just the depth of the game right now, is so great,” said the 18-year-old Raducanu, who will rise into the WTA’s top 25 on Monday. The first female qualifier ever to reach a Grand Slam final, let alone win one, proved that emphatically.