Greek Grandmaster. Greek co-champion in 2003. Greek U20 Champion in 2002.
Best results: won or shared first in Thessaloniki Open 1999, Kavala Open 2000, TS Novi Sad 2002, MCA Lebanon 2003, Acropolis and Karadjorje 2004, Groningen Open 2008 and Artemis Cup 2012.
Also second in Acropolis 2007 and at the Greek Championship 2011.
A participant in the Olympiads since 2000, and at the 2004 World Championship.
Dimitrios is the younger brother of the GM Athanasios Mastrovasilis.
Greek Grandmaster. Greek co-champion in 2003. Greek U20 Champion in 2002.