Thailand, seeking to lift the trophy for a record-extending eighth time, got off to a fast start with Ben Davis putting them ahead in the fourth minute.

Patrick Gustavsson doubled the advantage in the 17th minute with Suphanat Muenta netting the third in the 28th. Davis scored his second of the evening four minutes later.

Thailand upped their tempo in the second half at the Hang Day Stadium with Suphanat netting again in the 54th minute.

That was followed by a blitz of goals as Seksan Ratree scoring in quick succession (56th, 61st) and Teerasak Poeiphimai also netting two (79th, 90+2). Nicholas Mickelson completed the emphatic win with his strike in stoppage time.

An exciting match at the Olympic Stadium in Phnom Penh saw the sides exchanging leads before settling for a share of the points.

Malaysia took the lead in the 35th minute with Stuart Wilkin burying Daniel Ting's cross in the back of the net with a powerful header.

Cambodia drew level seven minutes after the break when a misplaced pass by Malaysia's Jimmy Raymond allowed Sokyuth Kim to intercept and tee up Abdel Kader Coulibaly, who slotted home.

Cambodia went ahead in the 59th minute through substitute Ty Sa but Fergus Tierney rescued former champions Malaysia a point with his goal in the 75th minute.

Up next for Cambodia are Singapore on Wednesday while Malaysia will meet Timor-Leste.

Group B action on Monday will see Myanmar playing Indonesia and Laos facing Vietnam.