19 Slams: Nadal stops Medvedev comeback bid to win US Open

Rafael Nadal, of Spain, reacts after defeating Daniil Medvedev, of Russia, to win the men's singles final of the U.S. Open tennis championships Sunday, Sept. 8, 2019, in New York. (AP Photo/Eduardo Munoz Alvarez)

NEW YORK — Rafael Nadal’s 19th Grand Slam trophy went from inevitable to suddenly in doubt in a thrill-a-minute U.S. Open final.