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.
"My aunt is not feeling well health-wise and I don't know how much longer I have her in my life," he said.
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.
"If there was a wish I could make, I would wish good health on everyone but unfortunately it's not possible."
A mediados de somana ya calentaron el ambiente con el despliegue do una gigantesca lona en Madrid, donde podía apreciarse la silueta de un jugador encapuchado. El secreto ha sido desvelado y, sin duda, no ha dejado a los aficionados indiferentes.
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.
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England interim boss Lee Carsley says their win over the Republic of Ireland has boosted his confidence - admitting he had doubts about his ability to do the job.
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.
It has been nearly 50 years since a man won their first and second Grand Slam titles in the same season, and Sinner is now a long way clear of the rest at the top of the rankings.
It comes just 19 days after it was revealed he had been cleared of any wrongdoing after twice testing positive for a banned substance in March.
Tom Hanks stars in an intense thriller based on true events. VideoTom Hanks stars in an intense thriller based on true events
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.
Just six days before the main draw got under way, it was announced he had twice tested positive for low levels of a metabolite of clostebol - a steroid that can be used to build muscle mass - in March.
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.
Sinner was ruled to bear no 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 Sinner soon quashed those dreams, breaking back as 星空体育app Fritz attempted to serve for the set and doing the same two games later to wrap up the win after two hours and 16 minutes.
"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."
"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.