The meeting lasted 1 hour 19 minutes and ended with a score of 4: 6, 4: 6.
Khachanov filed right through four times, made one double mistake and failed to convert a single break point out of the two.
Monfils, on the other hand, made six aces, did not make double mistakes and took the opponent's serve twice.
At the same time, the French tennis player as a whole looked better at the reception, having won 21 out of 59 possible points, while Karen took only 10 out of 51 draws at the reception.
For Monfils, this is the 11th career title won.
Earlier it was reported that Veronika Kudermetova lost to Simone Halep in the final of the WTA tournament in Melbourne.