The Gavin Lee-coached Lions doubled their advantage 11 minutes into the second half when Song nodded home from eight yards out, the midfielder meeting Kyoga Nakamura’s cross from the left to beat Dylan Niski.

The win moves the Singaporeans onto six points from their opening two matches in Group A, three points ahead of defending champions Vietnam and the Indonesians, who impressed in their tournament opener at home with Mitch Baker scoring a hat-trick on his debut.

The Australia-born striker scored barely five minutes into his first appearance for John Herdman’s side, rising highest to meet Thom Haye’s free kick from deep into the Cambodian penalty area.

Baker doubled his side’s lead 10 minutes later when he finished off a fast-paced flowing move that saw Marc Klok release Eliano Reijnders down the right flank and his cross was steered home by the towering 19-year-old forward.

Sandy Walsh added Indonesia’s third in the 24th minute with a header from Haye’s corner but Chea Sokmeng pulled one back for the Cambodians three minutes into the second half with an effort from a tight angle that goalkeeper Nadeo Argawinata palmed into his goal.

However, Baker completed his hat-trick in the 56th minute when he powered home another header from a Haye cross. Jens Raven then came off the bench to complete the scoring, rolling the ball into the empty net four minutes from time after a mix up in the Cambodian defence.

Photos: Football Association of Singapore