Ishaq Kayode Rafiu’s goal in the 51st minute gave the Wike Boys all three points and a crucial away victory.
Enyimba failed to maintain their winning streak against the Port Harcourt-based side after making it 5 wins in 5 games in all competitions.
Since 2016, Enyimba International and Rivers United have played 12 games, with Enyimba International winning four times and drawing four times.
Enyimba is currently in fifth place after failing to pass Remo Stars, who are currently in first place, and Rivers United, who are currently in third place.
A historic win for Rivers United, who cruise to new year with a victory.