Chonburi 2 v 2 Ratchaburi (2-3)
First half headers from Prayad and Banluesak had the tie wrapped up as Ratchaburi took a 3-0 aggregate lead into the break. Chonburi at least savaged some second half pride with goals from Kraikitti and Jetsadakorn keeping the contest interesting. Ratchaburi had Jang Gil Hyeok ordered off 18 minutes from time, but the 10 men Dragons held out to progress to the semi finals.
Luk Tapfah 1 v 2 Rayong FC (2-3)
Wacharin's first half solo goal had Luk Tapfah heading towards the last 4, but the Wild Horses staged a second half comeback to win 2-1. Anukorn's 52nd minute free kick levelled the tie on the evening before the home side were reduced to 10 men after Captain Komsak was given a second yellow card following a reckless waist-high kick at one of his opponents. Piroj headed the winner with ten minutes remaining to secure a semi final berth for Rayong FC.
Nakhon Ratchasima 2 v 0 Army Utd (2-1)
A goal in each half helped Nakhon Ratchasima overcome a lackluster Army United. Within seven minutes, Army's first leg lead was wiped out when Yusuke Kato capitalized on slack defending down the right flank to open the scoring. New boy Douglas Lopes was set up by Prompong to score the winner in the second half. Chaiwat and Adison were both dismissed for Army as Korat earned a deserved 2-0 victory.
Udon Thani 1 v 2 Buriram United (1-3)
A full house at the IPE Udon Thani Stadium had to wait patiently for an hour as a massive downpour delayed the kick off. The sight of seeing ballboys trying to clear excess water off the pitch with tables suggested the locals were desperate to get the match on.
An early Adisak strike and a close range goal from Berrocal had the tie won for the cup holders before the regional league side grabbed a late consolation.