Two early strikes from Thai Port helped ease their relegation worries and consigned Buriram United to a first away TPL defeat of the season.
The Klong Toei side started with a positive line-up and it paid dividends as they were two up after a quarter of an hour.
The first goal was scored when Whoo Hyun slotted home after a free kick from the left wasn't cleared in nine minutes, and Sarawut finished off with his left peg following an intricate pass as the hosts coasted into an unexpected early 2-0 lead.
Buriram seemed a bit lethargic and the closest they came to a goal in the opening period was a Suriya shot which was blocked by Wanlop's leg.
The second half fightback from the Thunder Castle never materialized and Wanlop in the Thai Port goal was never really stretched. Buriram did however grab a consolation deep into injury time when Theerathon smartly netted a penalty kick. It was too little too late as Port held on for a memorable victory.
It was certainly a day of contrasts as I reckon that's the best Thai Port performance that I've seen since the 2010 Toyota League Cup Final which also coincidentally finished with Thai Port beating Buriram PEA 2-1. Today Port just looked that bit sharper as their players continually closed down opponents and defended stoutly against a weary Buriram United. The TPL champions lacked creativity and the amount of misplaced passes must have been alarming for the coaching staff sat on the Buriram bench.