"My aunt is not feeling well health-wise and I don't know how much longer I have her in my life," he said.
He is 23-years-old and Alcaraz just 21. They ended up sharing the year’s Grand Slam titles, and - with an eye to the future - that is an ominous thought for the rest of the world.
"I know we have been waiting for a champion for a long time so I'm sorry I couldn't get it done this time," said Fritz.
Sinner said the title "meant so much because the last period of my career was not easy" before he became tearful and dedicated the victory to his aunt.
"He's stepped up a role and I feel like he's taking everything as seriously as he can and fair play to him, that shows he wants to stay."
He subsequently parted ways with the physio and his fitness trainer - but questions continued about whether Sinner's case had been handled differently to those of other players because of his world number one status.
It marks a new era of tennis as 24-time major winner Novak Djokovic, who was knocked out in the third round, ends the year without a Grand Slam title for the first time since 2017.
Refusing to dwell on the first set, Fritz improved and made the second a closer affair, losing just two points in four service games.
However, Sinner then underlined his status as world number one, upping the ante when it mattered most to strike the crucial blow as Fritz served to stay in the set at 5-4 down.
The 26-year-old recovered well to win three games in a row, but he continued to falter on serve and Sinner capitalised to take the opener and subdue the expectant mood on Arthur Ashe Stadium.
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Andy Roddick, who was watching from the stands, remains the last American man to lift a major singles trophy, having won the US Open in 2003.