NEW YORK (Reuters) - Win or lose in Saturday's U.S. Open final, teen sensations Emma Raducanu and Leylah Fernandez have already cemented their star power after announcing themselves on the big stage at Flushing Meadows.

The two unseeded players were virtually unknown quantities this year but Fernandez -- who turned 19 this week -- beat three top-five seeds along the way while Raducanu became the first qualifier to reach the final of a tennis Grand Slam.