Daniil Medvedev has ended Novak Djokovic's 361 weeks at the top of men's tennis to become the 27th world No 1 in the ATP rankings.
Medvedev (8,615 points) passes Djokovic (8,465), who held the top spot in men's tennis for a record 361 total weeks.
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"Of course I am happy to reach No 1," said Medvedev. "It was my goal since I was young and especially my goal in the latest times.
"I got a lot of messages from many people and from other tennis players and I just want to thank everybody for the big support."
Guaranteed to claim the top spot when Djokovic lost in the quarter-finals of the Dubai Duty Free Tennis Championships against Jiri Vesely, Medvedev has won 13 tour-level titles, including four Masters 1000 crowns.
He also claimed the prestigious season-ending ATP Finals trophy in 2020.
Medvedev is the first player outside the 'Big Four' of Djokovic, Roger Federer, Rafael Nadal and Andy Murray to hold the top spot in 18 years, three weeks and six days, since Andy Roddick on February 1, 2004.
The last time there was a new world No 1 was more than five years ago, when Murray clinched top spot on November 7, 2016.
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