Biographical information from ATP. Unless noted otherwise all data as of year-end 2013.
- Began playing at age five
- Born in Orenburg, Russia and now resides in Tashkent, Uzbekistan
- Nicknamed "Deni"
- Father, Oleg, is a businessman; mother, Klaudiya Istomina, coaches her son
- Has a younger brother, Anton
- Speaks English and Russian
- Suffered a leg injury in a car accident traveling to a Futures event in Tashkent in April 2001, underwent surgery which required as many as 80 stiches and spent three months in the hospital
- Did not touch a racquet for two years, resuming training in April 2003
- Likes soccer (supports Real Madrid) and playing pool
- Graduated from University of Physical Culture & Sport in Uzbekistan with degree in physical culture in June 2011.
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