Thiem first since 1949 to win US Open after ceding first two sets

Dominic Thiem, of Austria, reacts after defeating Alexander Zverev, of Germany, in the men's singles final of the US Open tennis championships, Sunday, Sept. 13, 2020, in New York. (AP Photo/Frank Franklin II)

NEW YORK — A U.S. Open unlike any other finished unlike any other — with an unprecedented fifth-set tiebreaker as Dominic Thiem became the first man in 71 years to win the final after dropping the opening two sets.