Pattaya United lost to the only goal of the game on the road against Ratchaburi on Saturday 8th of April
The winning goal came in the 74th minute from 30-year-old Sompong Soleb.
The defeats sees United slip to 12th in League One after eight matches.
Elsewhere Muangthong United regained top spot winning away from home in a fine 4-1 result over bottom club, Samut Prakan.
Chiangrai United hold second position, despite losing at home to Port.
Buriram and Ubon fought out a close 1-1 draw that sees them sit in third and fourth place respectively.
Pattaya’s next match is a home affair against Suphanburi, who are two places and two points behind United in the League.
The match kicks off at the Nong-Prue Stadium at 20:00