Daegu and Pohang Steelers both recorded comfortable wins in K-League action on Sunday.
Lee Jin-Ho netted a hat-trick as Daegu accounted for Daejeon Citizen 4-1 at Daegu Stadium.
Lee opened the scoring in the third minute before adding a second goal on 42 minutes.
Brazilian midfielder Leandro Lima tripled the advantage before the interval, with Lee putting the result beyond doubt in the 51st minute.
Forward Alex Terra netted a consolation goal for the visitors.
Pohang recorded a 4-0 victory at Gyeongnam with goals from Ko Mu-Yeol, Hwang Ji-Soo, Kim Won-Il and Lee Myeong-Ju.
Elsewhere, Seongnam hosted the Chunnam Dragons in a 2-2 draw.
Park Sun-Yong put Chunnam in front after 17 minutes though the teams were back on level terms when Hong Chul struck 11 minutes later.
Chunnam took the lead again through Lee Jong-Ho in the 55th minute but the advantage lasted just six minutes as Jeon Hyeon-Chul struck the equaliser.
Suwon Bluewings and Ulsan played out a 0-0 stalemate in Suwon.