Its not unknown boy at all. The boy who beat Tommy Sugiarto is Lu Qi Cheng. If I am not wrong, Lu just beat Simon Santoso in China Open 2006 recently in 2 sets. Eventually, Lu lost to Lin Dan in R16. Looks like Lu Qi Cheng had good chances to win the Junior MS.
The most ridiculuous thing is the day before the match between Indonesia and China matches in Junior WC, Indonesia coaches and officials are so confident they can win over China cause they think Tommy will win easily over Lu Qi Cheng. Cause they said based on world ranking Tommy now rank 54 meanwhile Lu did not had a ranking. How foolish this statement is. Indonesia officials and coaches should check about Lu much much better than only check his ranking. They should at least asked all Indonesia MS in pelatnas, who had meet Lu Qi Cheng. If they asked they will know that Simon lost to Lu recently and will be more careful and caution when they speak. Turn out Indonesia number 4 or 5 MS even cannot win against China Lu QC who probably rank only 10 or lower than that in National team.