K-League leaders Ulsan slipped up again on Wednesday as they slumped to a 1-0 home defeat against Seongnam.
Kim Cheol-Ho scored the only goal of the game in the second half at the Munsu Cup Stadium to ensure the hosts are now without a win in three games in all competitions.
Ulsan were held to a goalless draw at Busan I'Park on Sunday and were toothless once again, as champions Pohang Steelers and Jeju United took advantage by securing victories which moved them level on points with Cho Min-Kook's men.
Kim Seung-Dae helped himself to a second-half brace to double his K-League tally for the season in the Steelers' comfortable 3-0 home victory over Gyeongnam.
Kang Soo-Il had opened the scoring seven minutes before half-time as the home side stretched their unbeaten run in all competitions to seven games.
Kim has now scored in his last four games for the club.
Park Kyung-Hoon's United side leapfrogged Jeonbuk into third spot with a 2-0 win, which came courtesy of second-half goals from Yoon Bit-Garam and Kim Hyun.
Sangju Sangmu recorded their first league victory of the season at the seventh attempt by seeing off FC Seoul 2-1.
Ha Tae-Goon put them in front just before the half-hour mark and Lee Keun-Ho sealed the points after Sergio Escudero had come off the bench to equalise for the visitors.
Incheon United are now the only side still awaiting their first K-League triumph of the campaign, but the rock-bottom side were able to take a point from a goalless draw at home to Busan I'Park.
Suwon Bluewings were 1-0 winners against Chunnam Dragons in the other game to be played on Wednesday.
|Ba left out of Senegal AFCON squad|
|Redknapp frustrated by penalty call|
|Wenger sees Giroud wrongs|
|Premier League schedule a ´disgrace´, says Poyet|
|Championship Review: Bournemouth stay top, Heskey scores on Bolton debut|
|Hughes lauds Bojan performance|
|Koeman: Saints marching on|
|Pardew rues referee error|
|Arsenal 2 QPR 1: Sublime Alexis secures the spoils|
|Martinez questions Walters decision|
|Poyet laments Sunderland mistakes|
|League One Review: Swindon cruise to win over Walsall|
|Irvine aware of need for improvement|
|United still doing ´very bad things´ - Van Gaal|
|Lambert proud of players despite Swansea defeat|
|Warnock bemoans Palace defence|
|Bruce hails Hull´s spirit|
|Pochettino relieved to come away with victory|
|Dyche: We had our pocket pinched|
|Monk hails Fabianski performance|
|Pearson demands greater concentration from Leicester|
|Kompany set for City return|
|Rodgers hails character after battling win|
|League Two Review: Ainsworth frustrated by Luton, Shrewsbury go top|
|Everton 0 Stoke City 1: Lacklustre Everton slip to defeat|
|Sunderland 1 Hull City 3: Triumphant return for Bruce|
|Burnley 0 Liverpool 1: Sterling wins it at Turf Moor|
|Leicester City 1 Tottenham 2: Eriksen piles misery on Pearson´s men|
|Manchester United 3 Newcastle United 1: Rooney extends hosts´ streak|
|West Brom 1 Manchester City 3: Three and easy for in-form champions|
|Swansea City 1 Aston Villa 0: Hosts break Boxing Day duck|
|Crystal Palace 1 Southampton 3: Mane marks return with star performance|
|Allardyce upbeat despite defeat|
|Van Dijk happy at Celtic - Deila|
|Table-topping Chelsea delight Mourinho|
|Chelsea 2 West Ham 0: Mourinho´s men ease to victory|
|Suarez enjoying Messi, Neymar link-up|
|A-League Review: Garcia rescues point for Perth, Adelaide up to second|
|Poyet calls for mid-season break|
|Van Gaal rules out Januzaj move|
|Rodgers: Balotelli may have to get used to bench|
|Lallana: I was trying too hard|
|Walker juggles music, football careers in Sweden|
|Song to face ´brother from another mother´ Fabregas|
|Adriano announces Le Havre deal|
|Pardew braced for Old Trafford test|
|Lescott unfazed by City reunion|
|Tskhadadze appointed Georgia coach|
|United to finish top three - Ferdinand|
|Allardyce: Stamford Bridge stalemate saved my job|
|Southampton need three January signings, says Watson|
|Liverpool can make Champions League, says fanzine editor|
|Walsh: Hull clash crucial for Leicester|
|Toure, Aubameyang and Enyeama make shortlist for African gong|
|Docherty backs Chelsea to win two-horse race|
|Liverpool could benefit from Hyypia influence - Scales|
|Saudi Arabia name Asian Cup squad|
|Forty-year-old Cahill no problem for Postecoglou|