Sept 10 (Reuters) - Factbox on the U.S. Open women"s final between British 18-year-old Emma Raducanu and Canadian 19-year-old Leylah Fernandez: U.S. OPEN WOMEN"S FINAL MILESTONES * First Grand Slam final in the Open Era in the men"s and women"s game to feature two unseeded players. * First Grand Slam final to be contested by two teenagers since the 1999 U.S. Open when American Serena Williams beat Switzerland"s Martina Hingis 6–3 7–6(4). EMMA RADUCANU * First qualifier in the men"s and women"s game to reach a Grand Slam final. * First British woman to reach the U.S. Open final since Virginia Wade won the title in 1968. * First British woman to reach a Grand Slam final since Virginia Wade won Wimbledon in 1977. * Youngest British Grand Slam finalist since Christine Truman won Roland Garros in 1959. * First woman to reach the U.S. Open final without dropping a set since German Angelique Kerber in 2016. * Entered the tournament ranked world number 150 and will move up to 32nd by reaching the final. Raducanu will be world number 24 if she wins the title. * Regardless of the result, Raducanu will end Johanna Konta"s 310-week reign as the top-ranked British woman on Monday. Konta is ranked 47 in the world. LEYLAH FERNANDEZ * Second Canadian in three years to reach the U.S. Open final after Bianca Andreescu was crowned champion in 2019. * Fourth Canadian in the men"s and women"s game to reach a Grand Slam final after Eugenie Bouchard (2014 Wimbledon), Milos Raonic (2016 Wimbledon) and Andreescu. * Youngest player to beat three top five seeds (3-Naomi Osaka, 5-Elina Svitolina and 2-Aryna Sabalenka) at a Grand Slam since American Serena Williams accomplished the feat when she won the U.S. Open in 1999. * Entered the tournament ranked world number 73 and will move up to 27th by reaching the final. Fernandez can become world number 19 if she wins the title.