Heartland surprised host Enyimba 2-0 at a match on matchday 15 of Nigeria Professional Football League in Aba on Wednesday, reported Completesports.com.
Stanley Dimgba missed a chance to put Enyimba ahead of the game after 26 minutes.
Sadiq Abubakar put the visitors ahead at the half hour mark after a brilliant solo effort.
Enyimba's Chukwuemeka Obioma scored a second for Heartland at the end of the first half.
Enyimba fought hard to get back into the game after the break, but Heartland goalkeeper Ikechukwu Ezenwa produced several impressive saves to deny the home team.
Former champions Enugu Rangers also recorded a 2-1 away win against Warri Wolves at Warri City Stadium.
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Flying Antelopes reached a two-goal lead early in the game thanks to goals from Kelvin Itoya and Kenechukwu Agu.
Charles Atsemene reduced the deficit for the hosts four minutes before the break.
Rangers finished the game with 10 men after Agu was sent off for a second booking after an elbow attack on Abu Azeez.
In Akure, Plateau United lost 2-1 against Sunshine Stars.
Timileyin Ogunniyi fired Sunshine Stars ahead 11 minutes after he was eliminated by Anthony Omaka.
Fuad Ekelojuoti doubled Owena Waves's lead after 33 minutes.
Uche Onwuasonya reduced the deficit three minutes before the half hour mark after Michael Ibeh was hired.
Rivers United moved up to second place after a 2-1 win against leaders Lobi Stars at Aper Aku Stadium in Makurdi.
Nelson Esor waved to Konan Ruffin's cross in the second minute, while John Lazarus swerved home from Omotayo Adebogun in the 19-minute pass.
Malachi Ohawume scored Rivers United's winning goal 15 minutes from time.
At Godswill Akpabio Stadium in Uyo, Kwara United ended Akwa United's unbeaten six-game run by beating the hosts 2-0.
Alao Danbani scored both goals for Kwara United.
Norhern derby between Katsina United and Kano Pillars ended 1-1 at Muhammadu Dikko Stadium.
Seun Adelani Yusuf put the Pillars ahead 34 minutes while Tasiu Lawal equalized for the hosts 10 minutes later.
MFM returned from a goal to beat Jigawa Golden Stars 2-1 at Agege Stadium.
Joshua Akpuje conceded a goal on time, but later scored twice in 41 and 69 minutes respectively to give the Olukoya Boys all three points of the game.
The classic between Abia Warriors and FC Ifeanyiubah at Umuahia ended 2-1 in favor of the home team.
Lukman Hello and Yakub Hammed were targeted by Abia Warriors in the game, while Jimoh Gbadamosi scored the visitors' only goal at the venue.
Wolves 1-2 Rangers
Abia Warriors 2-1 FC Ifeanyiubah
Enyimba 0-2 Heartland
Katsina Utd 1-1 Kano Pillars
Akwa Utd 0-2 Kwara Utd
Sunshine Stars 2-1 Plateau Utd
MFM 2-1 Jigawa GS
Rivers Utd 2-1 Lobi
Adamawa Utd 0-0 Wikki
By Adeboye Amosu