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At the U.S. Open, players’ dogs are a key part of the entourage, and they have the run of the place.

By Ashley Ahn

A day in the life of Quincy, a 5-year-old labradoodle that traveled to the U.S. Open with his owner, the tennis player Danielle Collins, sounds like something out of a Hollywood film.

He wakes up to a skyline view of New York City from the penthouse of a five-star hotel. A chauffeur takes him to Flushing, Queens, where excessive coddling and belly rubs await. Chefs prepare a plate of bacon and eggs for breakfast, and salmon for lunch. And after a hard day of work, in which he mostly watches Ms. Collins practice, a professional massage therapist works on his worn-out muscles so he can do it all again the next day.