NEW YORK (Reuters) - Leylah Fernandez and Emma Raducanu will clash in one of the most improbable U.S. Open finals on Saturday, the teenagers' fearless tennis bringing them to the cusp of becoming the sport's newest major champion.

Their title clash under the lights at the Arthur Ashe Stadium will be the first major final in the Open Era in either the men's and women's game to feature two unseeded players.