Russia's Karen Khachanov defeated incoming world number one Novak Djokovic to win his first Masters 1000 title at the Paris Masters, reports BBC.
The 22-year-old beat Djokovic 7-5 6-4 in one hour and 37 minutes to end the Serb's 22-match unbeaten run.
Fourteen-time Grand Slam champion Djokovic, 31, will still overtake Rafael Nadal at the top of the world rankings on Monday.
"It means the world to me," said world number 18 Khachanov.
"It's one of the biggest titles in my career so far. I couldn't be happier to end the season like this, to win against Novak Djokovic, the number one in the world."
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