Bangkok Glass remains winless after four matches when they lost 1-0 at home to Insee Police United in the Thai Premier League.
Thanat Wongsupaluck's header shortly before the first half break was enough for the visitors to secure a victory in front of almost 5,500 home team fans at Leo Stadium.
The defeat condemned Bangkok Glass to one point from four matches this season.
In other matches, Army United beat Pattaya United 2-1, Suphanburi FC edged Samut Songkhram FC 1-0, Chainat FC and Chiang Rai United ended scoreless, and Ratchaburi FC and Chonburi FC closed out with a 1-1 draw.