Thai Premier League Wrap: Duo suffer first defeats
Chonburi continued their bright start to the campaign, climbing to third as goals from Anderson Dos Santos and Thiago Cunha gave them a 2-1 victory over Samut Songkhram.
Yusuke Kato netted a consolation for Samut, but Somchai Chuayboonchum's men remain bottom of the table and without a win this season.
BEC Tero Sasana moved to fourth after posting a 2-1 triumph against Sisaket. Georgie Welcome and Sho Shimoji scored, meaning Pak Nam-Chol's late consolation meant little.
After five wins in their opening seven matches, newly promoted Singhtarua lost their league lead after falling to a surprise 2-0 defeat at TOT on Wednesday, while Ratchaburi were beaten 2-1 by Osotspa.
A penalty from Takahiro Kawamura and Prakit Deeporm's second goal of the season secured victory for TOT.
Ratchaburi looked to have rescued a point against Osotspa when Douglas levelled proceedings with 12 minutes left - only for Tangeni Shipauhu to score an 87th-minute winner.
Muang Thong United are the new leaders after their comprehensive 4-1 victory over PTT Rayong. Mario Gjurovski netted a first-half double for the winners, while Teerasil Dangda also got on the scoresheet.
Air Force United continue to search for their first win of the season after they were beaten 2-0 by Chiangrai United, while Bangkok United dropped to 18th after a 1-0 defeat to Songkhla United.
Elsewhere, Army United ended a two-game losing streak with a 3-2 win over Bangkok Glass, Chainat collected a 2-1 win over Police United and Buriram United held Suphanburi to a 1-1 draw.