Australian Open
Alex Michelsen & Learner Tien: from pre-season to flying into Australian Open week two together
The 20-year-old and 19-year-old each claimed straight-set wins in third-round action Saturday.
Khachanov has fallen to Dimitrov four times prior, and finally has a win to his name in the head-to-head.
Khachanov faces Alexei Popyrin in the round of 16, with whom he leads the head-to-head 3-1.
Khachanov meets wild card Mpetshi Perricard, who upset No. 14 seed Frances Tiafoe, in the second round.