Novak Djokovic sees off Monte Carlo Masters champion Stefanos Tsitsipas to claim the last major tournament before French Open, while Iga Swiatek beats Ons Jabeur to retain the women's title.
A British court declared tennis legend bankrupt in 2017 after he failed to pay a long-standing debt.
Barty, the first Australian woman into the final of her home Grand Slam since 1980, is looking to add to her 2019 French Open and 2021 Wimbledon titles.
Organisers say 34-year-old Novak Djokovic, who had repeatedly declined to reveal his vaccination status, applied for a medical exemption, which was granted after a "rigorous review process".
Djokovic so far has declined to disclose his vaccination status amid local media reports that everyone on the entry list needed to be vaccinated or have a medical exemption.
Naomi Osaka has struggled for form after withdrawing from French Open in May after a row with tournament officials over required media appearances.
Medvedev, playing in his third major final, at last hoisted a Grand Slam trophy while avenging a straight sets defeat by Djokovic earlier this year in the Australian Open final.
Emma Raducanu has become the youngest Grand Slam champion in 17 years, ending the tournament as the first player since Serena Williams in 2014 to not drop a set in the US Open.
One more victory will give the 34-year-old Djokovic the first calendar-year Slam since Rod Laver accomplished it 52 years ago.
Emma Raducanu, an 18-year-old from Britain who is ranked 150th, and Leykah Fernandez, a 19-year-old from Canada who is ranked 73rd, will clash in first Grand Slam final between teens since 1999.
World number one Novak Djokovic admits that his exertions in Japan have taken their toll after pulling out of the Tokyo Olympics due to a shoulder injury.
Serbian tennis player Novak Djokovic breaks Roger Federer's record for most weeks as the men's top number one, and plans to win many more Grand Slams.
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