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LONDON — For the first time since 2007, and only the second time in the ATP Finals’ 49-year history, only one American player competed in singles or doubles at the elite year-end event.
He was not John Isner, the highest-ranked American man in singles, who played in the tournament last year. He was not Jack Sock, a singles semifinalist two years ago and a winner in doubles in 2018.
He was not Bob or Mike Bryan, members of the most successful men’s doubles team ever. They qualified for the tournament for the 17th time, but opted not to play.