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 do semanada ya calentaron el ambiente con el despliegue de 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.
Refusing to dwell on the first set, Fritz improved and made the second a closer affair, losing just two points in four service games.
It was more straightforward in New York as he rarely looked troubled by Fritz, who struggled to build any momentum.
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.
A world champion cyclist has swapped the velodrome for the cramped deck of the fastest yacht in the world. Why?
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.
Este é identicamente conjuntamente este ano do 4k: a SPORT TV foi o primeiro canal português a transmitir um evento desportivo, a final da Champions entre o Real Madrid e este Atlético Madrid, utilizando a tecnologia do 4k, de que permite aumentar em quatro vezes a qualidade da imagem. Este nosso primeiro passo em 2016 confirmou uma aposta permanente em 2017, usando o início DE emissões regulares em 4k.
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 星空体育官网 low levels of a metabolite of clostebol - a steroid that can be used to build muscle mass - in March.
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.
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.
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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.