Russia's Karen Khachanov upset world No. 2 Novak Djokovic 7-5, 6-4 to earn his maiden Association of Tennis Professionals (ATP) World Tour Masters 1000 title and ending the Serbian star's 22-match winning streak.
After the two players held their serves for 4-all, Khachanov broke for the first time before bagging the first set 6-4.
Victory would have marked Djokovic's fifth Paris Masters title but he was not allowed to settle into Sunday's match and was undone when Khachanov broke his serve at 5-5 before going on to win the first set.
Djokovic's fourth straight win over Federer and 25th in 47 contests sends him into the final against unseeded Russian Karen Khachanov, who has never played in a Masters final.
"I won 20-plus matches in a row and had a most unbelievable last five months of the year", Djokovic said following his 7-5, 6-4 defeat by Russia's Khachanov.
"Karen played really well and he deserved to win", Djokovic said.
"I'll probably be able to speak more profoundly about it when the season is done and hopefully if I get to finish as No. 1".
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Federer fended off two more break points to open the third set as Djokovic hit the deck when his ankle appeared to catch in the surface. "I'm just really proud of myself that I could be in this list of winners". Federer is two wins shy of his 100th career title.
It was the first Masters title to be won by the 22 year-old Russian and his third ATP title this year.
All eyes then turned to No9 Kei Nishikori, who took on Roger Federer for the second time in a month. Federer's down the T serve was returned well by Djokovic straight in the middle and the Swiss ace took his time before whipping it to Djokovic's right to what looked like a sure victor.
"We had epic matches throughout our rivalry but this one definitely ranks as one of the best", Djokovic said.
"I was thinking, 'OK, (Djokovic) has, I don't know, 70 titles and I have three, '" Khachanov said.
"I need to keep on working with my team and to improve day by day and to compete with guys like Novak at the biggest tournaments more consistently". But already, an established player, top player.
'And he showed great quality today and he showed why we're going to see a lot of him in the future'.