The incident took place during the first set that Djokovic was leading 4-3 with an advantage while returning Federer's serve. The 22-year-old Russian tennis player praised his opponent after the triumph.
Djokovic explained that his rivalry with Roger Federer is "special" because of the level the pair rise to when they play each other.
Djokovic struggled to handle Khachanov's brutal two-handed, cross-court backhands from the baseline, which often landed near his ankles, and dropped his serve again to trail 2-1 in the second set. "He can really hurt you".
Djokovic, a record four-time champion at the indoor event, looked out of energy after an epic three-hour semifinal win against Roger Federer on Saturday. However, the Serb superstar avoided a question about the effects of exhaustion on his Sunday game. I want to talk about how well he (Khachanov) played all week.
'So all the credit to him.
Despite not being broken in the match, Federer's quest to become just the second man with 100 ATP titles will have to wait, as he sits on 99 with just the year-end ATP Finals left this season. 'I couldn't be happier to finish the season like this'.
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"I'm satisfied of course and I'm going to be No. 1 tomorrow".
"The second thing is after some tough loses against top guys like Rafa in NY, I think they push me to the limit and even to work more harder".
'It means the world to me, ' added Khachanov said after the match.
"I watched (Safin's) matches but later, not at the age of eight", he said. But, just as a victor is someone who is always adjusting to adversity, Federer stuck out his racquet at the last moment which was a sheer reflex as the ball fell on the other court with a little bit of spin miles ahead of Djokovic, who was standing at the baseline.
The 14-time Grand Slam champion showed trademark resilience to fend off three break points while trailing 4-2, but Khachanov displayed steely composure to seal a memorable victory after an hour and 38 minutes.
But world number 18 Khachanov, a victor at the Kremlin Cup in Moscow last month, hit back in the very next game as Djokovic dragged a forehand into the tramlines, down break point. "So maybe it was in the back of my mind".