Lonsana Doumbouya converted a penalty in the last minute of extra time to help giants Buriram United get the better of underdogs Uthai Thani 2-1 in a last 16 round battle of the Thai FA Cup on Wednesday night.
Elsewhere, Port, under a duo of new coaches Choketawee Promrut and Surapong Kongthep, were impressive as they hammered Chiangmai United 4-0.
Defending champions Buriram United were expected to have a stroll at Uthai Thani Stadium but the hosts proved a tough nut to crack.
The Thunder Castle got their opening goal in the first-half injury time when Suphanat Mueanta set up Lonsana Doumbouya for a header with a lob from the right.
Thai League 2 side Uthai Thani equalised in the 65th minute from a shot by Steeven Langil and kept Buriram, the runaway leaders in the top flight, at bay until 90 minutes to force extra time.
The match was finally decided after 116 minutes when Doumbouya converted a penalty awarded -- Uthai Thani's Pattarapol Kansopha was penalised for pulling Jonathan Bolingi inside the box.
Buriram coach Masatada Ishii admitted that Uthai Thai played very well and he was "happy" to see his team go through to the next stage of the tournament.
In other matches on Wednesday night, Port had goals from Suphanan Bureerat (20), Elias Dolah (60), Bordin Phala (76) and Worachit Kanitsribumphen (88) to rout Chiangmai United.
T1 sides sail through
Nakhon Ratchasima fired five goals past Suphanburi for a convincing 5-1 victory.
Chiang Rai United edged Muang Thong United 1-0 after Felipe Amorin struck in the 100th minute of a clash between two T1 sides.
Bangkok United defeated Phitsanulok 2-1 after extra time, while BG Pathum United progressed to the quarter-finals by beating Lamphun Warriors 1-0 with Thailand striker Teerasil Dangda netting the winner.
Phrae United edged Pram Bangkok 2-1 after extra time and Police Tero advanced following a 6-5 shoot-out win over Si Sa Ket United in the wake of a 1-1 tie after extra time.