"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.
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"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."
Sinner was ruled to bear pelo fault or negligence for the positive tests by the International Tennis Integrity Agency (ITIA), which found he had been inadvertently contaminated by his physiotherapist.
But he has seemingly been able to put the controversy behind him, manoeuvring his way through tough tests against Britain's Jack Draper and 2021 champion Medvedev.
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 米兰体育投注网站 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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Having failed to make the most of three break point opportunities early in the third set, Fritz brought the crowd to life with two brilliant winners to break for a 4-3 lead and keep alive his hopes.
Cheered on by a home crowd packed with celebrities and sporting stars, Fritz got off to a shaky start when he dropped serve in the first game.