Update: this record has been broken!
Breaking News! Collin Burns (USA) breaks the Rubik's Cube single world record on Doylestown Spring 2015 official WCA competition. He managed to shave 3 tenth of a second off the record of Mats Valk (Netherlands), setting the new record to 5.25.
He was the 2014 US National Champion wth an average of 7-8 seconds for the 3x3. Collin regularly posts speedcubing videos to his YouTube channel (user name: collinbxyz).
The historic moment
The competitors gathering to see the new record