Russian Medvedev, who has won nine matches in a row, beats Spanish Nadal, world number two, 3-6, 7-6 (7/4), 6-3 during their ATP semi final match.
Austria's Dominic Thiem finally claims his maiden Grand Slam title with a stunning comeback to beat Germany's Alexander Zverev in a nerve-jangling battle of wills in the US Open final.
Austria's Dominic Thiem steamed into his first US Open final after defeating Russia's Daniil Medvedev 6-2, 7-6 (7), 7-6 (5).
Austrian Dominic Thiem beats Australia's Alex de Minaur to advance to US Open semifinals to meet Russian Daniil Medvedev
The 29-year-old Bulgarian tennis player had been competing in the Adria Tour exhibition tournament in Croatia until he withdrew as he fell ill during the weekend.
Novak Djokovic admits he was on brink of defeat with dizziness and dehydration before coming through a five-set thriller against Dominic Thiem to clinch title – also his 17th Grand Slam – and return to world number one.
Nobody beats Novak Djokovic at this stage of the Australian Open. At least, not until now. Djokovic is a seven-time champion at Melbourne Park, where he has never lost a final or semifinal he has contested.
Dominic Thiem is in rather fine form at the moment, with three consecutive wins over top-10 opponents, including No 1 Nadal in the quarterfinals and, now, Alexander Zverev.
Dominic Thiem will face Alexander Zverev for a place in the final, a match-up scarcely imaginable at the start of the tournament, after beating Rafael Nadal.
Greece's Stefanos Tsitsipas defeats Austria's Dominic Thiem 6-7 (6/8), 6-2, 7-6 (7/4) during the men's singles final match in London on day eight of the tournament.
US Open runner-up Medvedev, chasing his fourth ATP Tour title in a breakthrough 2019 season, will meet Germany's Alexander Zverev in Sunday's final.
Federer, a seven-time champion, was ousted from one of his favourite tournaments in barely over an hour, falling in straight sets to a 21-year-old Andrey Rublev he had never faced.
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