On a Friday morning in late July, the New York Giants were deep into training camp for the upcoming season, with dozens of athletes hoping to secure one of 52 spots on the team. Across the street, at MetLife Stadium, Sean Stellato swaggered through the largely empty corridors, totally at ease.

Mr. Stellato, a sports agent who represents Tommy DeVito, one of the Giants’ quarterbacks, wore an immaculately tailored light blue, double-breasted pinstripe suit, which he paired with snakeskin Gucci loafers, a gold Rolex Yacht Master II watch, and a smorgasbord of diamond jewelry, including an enormous gold ring, studded with diamonds, commemorating his induction into the National Italian American Sports Hall of Fame.

Naturally, Mr. Stellato also wore a fedora — his signature accessory. It was big and crimson, made by the Italian company Borsalino, which, he said, manufactures “the Rolex of fedoras.”

He walked up to the stands: Section 109, Row 36, Seat 20. The exact place he had been sitting on Dec. 11, 2023. The day his life changed.

That evening, he had gone to watch his client, an undrafted rookie quarterback, start a nationally televised Monday Night Football game. Mr. DeVito surprised N.F.L. fans everywhere with a late game drive that gave the Giants a victory over the Green Bay Packers, who were favored to win. After a Giants touchdown, television cameras cut to Mr. Stellato, clad in a black suit, gold chain and, of course, a fedora. He was pinching his fingers in a stereotypically Italian American manner, as Mr. DeVito’s father, Tom, planted a kiss on his cheek.

“The agent may break the internet,” one of the ESPN broadcasters said. He was correct.