The 21-year-old German goes on to face world number one Novak Djokovic later today.
Khachanov may have enjoyed his best week of career in the French capital after bettering No. 6 seed Dominic Thiem in their first meeting to reach a maiden ATP 1000 final. He served the set out crisply with three aces, taking his first serve percentage to 88 for the opener. Got back to world number one.
Djokovic needed just 75 minutes to secure his straight-sets triumph, the Serbian dropping only seven points on his serve as he made it eight wins in a row against the South African.
Anderson could only praise the dogged domination that Djokovic presents when he is in this frame of mind.
The momentum shifted slightly in the next game as Zverev hit loose back-to-back double faults to let Djokovic back in, but he was unaffected, again exerting vast pressure on the Djokovic serve to break for the third time in a row and re-take the lead. In the full-capacity Bercy Arena, the two superstars didn't let crowds down as their encounter went in a dramatic manner with two sets forced into tie-breaks.
'I'm happy I gave myself opportunities again in that second half of the season. "This is the biggest title I have won", said Zverev. We have never seen it before.
"I really can not describe it".
"The crowd have been absolutely fantastic all week".
"We [Djokovic and Zverev] had so many talks, not only about tennis but all different types of subjects - I won't mention what - but you are a sharing person and you have shared some titles with me".
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Federer was leading the second-set tiebreaker 4-3 and in the ascendancy of a rally on a Zverev service point when a ball boy at the back of the court dropped a ball.
'(Pete) Sampras once upon a time said, "If you win a Slam, it's a good season",' he said.
He's now within touching distance of a record-equalling sixth title at the year-ender.
The first racket of the world Novak Djokovic easily took the semi-final barrier at the Final tournament ATP in London.
And BBC pundit Tim Henman revealed how the German managed to overcome Djokovic. Zverev immediately signaled for the point to be stopped and the umpire ordered the point to be replayed. "I played very well in the group stage against Sascha (Zverev) but I don't think he was close to his best". I wish you all the best for your future.
"I want to thank my team for a great season". I just asked him, Did you drop the ball?
In men's tennis, 2018 has undoubtedly been the Year of Novak.