[2] Demekhine occasionally used to work as a model for Armani, Rocco Barocco, and Abercrombie & Fitch.

As a professional tennis player, Demekhine won one ITF Futures title in singles, and eight in doubles.

Demekhin made two appearances in a ATP Tour main draw in doubles, both at the Kremlin Cup.

In 2008, Demekhin partnered with Konstantin Kravchuk, but they were beaten by Sergiy Stakhovsky and Potito Starace 7–6(4), 1–6, [10–7] in the first round.

The two began working together in April 2010 after the 2010 Family Circle Cup in Charleston, South Carolina.