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.
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.
"If there was a wish I could make, I would wish good health on everyone but unfortunately it's not possible."
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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.
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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.
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Cheered on by a home crowd packed with celebrities 星空体育 and sporting stars, Fritz got off to a shaky start when he dropped serve in the first game.
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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 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 Sinner soon quashed those dreams, breaking back as 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.
The 23-year-old held his arms aloft and looked up to the sky as he became the first player since Guillermo Vilas in 1977 to win his first two Grand Slam titles in the same season.
"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.