Suwon Bluewings lost their hold on top spot in the K-League after losing 2-0 at Pohang Steelers.
A spectacular free-kick from Kim Jae-Sung after 19 minutes put Pohang in front and Shin Young-Min sealed the win with a fierce half-volley from the edge of the area with just three minutes remaining.
It was enough to put Pohang in third place on goal difference, while Suwon, who thrashed Shanghai Shenhua 4-0 in their midweek AFC Champions League clash, slipped into seventh after dropping their first points of the season.
"We were defeated all in all areas," said Suwon coach Yoon Sung-Hyo. "The players did their best but are not in the best of condition. Still, this is a very difficult fixture and the start we have had to this season is not bad at all."
Sangju Sangmu replaced Suwon at the summit after a 3-2 win against Seongnam Ilhwa Chunma. Sasa Ognenovski got his first goal of the season for the continental champions but could not prevent Sangju from taking three points thanks to a brace from Jang Nam-Seok and a Kim Jung-Woo goal.
K-League champions FC Seoul are still searching for their first domestic win despite collecting maximum points from their opening two games of the Champions League. The capital club crashed to a 3-0 defeat at Chunnam Dragons and are languishing in 15th place.
Jeonbuk Motors made it two wins out of two by coming back from two goals down to thrash Busan I'Park 5-2 . The 2006 Champions League winners are in fifth while Jeju United, who won 2-1 at Melbourne Victory in midweek, defeated bottom club Gangwon FC 1-0 to move into fourth.
Elsewhere, Ulsan Horang-I defeated Gwangju FC 2-1. Daejeon Citizen continued their good start to the season with a 2-0 win at home to Gyeongnam FC while Incheon United were held to a 1-1 draw by Daegu FC.
