Buriram slipped to a narrow 1-0 defeat to Lanexang in the Mekong Cup Final first- leg. In a lack -lustre first-half display, they fell behind in the seventeenth minute when Khampheng was left completely unmarked to head in a left-wing free-kick.
The nearest Buriram came was when Diogo headed a left-wing cross just over.
Buriram picked up the pace in the second-half and created several good chances. However, a combination of bad luck, poor finishing and good goalkeeping kept the home side in front to set up an intriguing contest in Bangkok on Sunday.
Diogo looked the most likely to score and it will still be a major upset if Buriram fail to overturn the one goal defecit.