Playing in front of their home fans, Singapore took an early lead through Fahrudin Mustafic's 10th-minute penalty.

Thailand captain Panupong Wongsa was stretchered off later in the first half with a suspected ankle injury but the loss of their skipper galvanised the Thai side.

And they claimed an important equaliser early in the second half when Adul Lahso swept home a Teerasil Dangda cutback.

Singapore responded within two minutes though, with Khairul Amri adding Singapore's second.

And in stoppage time Baihakki Khaizan extended the lead as Singapore wrapped up an important first-leg win.

Singapore are now favourites to win the title and will travel to Thailand for the second leg on Saturday.