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Novak Djokovic of Serbia (L) congratulates Daniil Medvedev of Russia (R) after their match in the men's singles final on day fourteen of the 2021 US Open tennis tournament. Photo: Reuters

Novak Djokovic's quest for a record 21st major title that would have completed the calendar-year Grand Slam collapsed at the final hurdle with a 6-4 6-4 6-4 loss to Russian Daniil Medvedev in the US Open final on Sunday.