Only one T4 team advances to the 2018 Thai League Cup playoffs

Sakon Nakhon (T4) v Rayong (T2) 0-5 

Surin Sugar Khongcheemool (T4) v Samut Sakhon (T2) 5-7 

Bangkok (T3) v Lampang (T2) 1-2 

Nan (T4) v Trat (T2) 1-3 

IPE Samut Sakhon United (T4) v Krabi (T2) 1-2 

Ranong United (T3) v Thai Honda (T2) 2-1 

Hua Hin City (T4) v Sisaket (T2) 0-3 

Nakhon Pathom United (T4) v Chiangmai (T2) 5-4 

Phrae United (T3) v Khonkaen (T2) 2-3 

Chiangrai City (T3) v Army United (T2) 3-4 

Trang (T3) v PTT Rayong (T2)2-0 

Surat Thani (T3) v Udon Thani (T2) 1-2 

Lamphun Warrior (T3) v Kasetsart (T2)1-3 

Ayutthaya United (T3) v Nong Bua Pitchaya (T2 1-5