The acting special agent in charge of the DEA's San Diego office said he was "deeply troubled" by the incident and he offered his "deepest apologies" to Chong.

CNN: Student forgotten in cell for 5 days will sue DEA

He's just the third to play the tournament, after Liang Wen Chong in 2008 and Lian Wei Zhang in 2004.

WSJ: A Master Class