Taylor Fritz and Frances Tiafoe were 5 years old. Ben Shelton was not quite 1.

The U.S. Open’s signature “ Honey Deuce ” cocktail was not yet born. Same goes for Facebook, YouTube, Reddit, Twitter, Instagram, Snapchat and Coco Gauff.

When Open fans took the No. 7 train to the National Tennis Center, not then named for Billie Jean King, they looked out the window at Shea Stadium. Citi Field still was a parking lot.

So, yes, it’s been a while since Sept. 7, 2003, when Andy Roddick won the U.S. Open, the last American man to win in Flushing — or at any tennis grand slam.

It is a stark turn from the early years of the U.S. National Championships, when American men won 44 of the first 45 tournaments between 1881-1925.

It also is a far cry from the late 20th century, when the U.S. won mor

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