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.
It was more straightforward in New York as he rarely looked troubled by Fritz, who struggled to build any momentum.
"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.
"It's nice I can still share these moments with her. She is an important person in my life and still is.
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.
Las audiencias de la Kings World Cup fueron muy buenas y con todo lo qual se viene por delante en los próximos meses, la liga espera continuar ofreciendo un 'show' de que tiene el fútbol como máximo exponente.
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 米兰体育投注网站 Arthur Ashe Stadium.
is a senior sports writer at Sport24, based in Johannesburg. He's been reporting on national sports for the past decade.
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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.
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