Captain Chidi Harmony opened the scoring floodgates with a hat-trick in the first 39 minutes.
Holding on to a 4-0 first-leg advantage, the 2002 bronze medalists adopted a calm and collected pattern that soaked up the pressure from the host.
The trio of Zoe October, Thoriso Mphelo and captain Katleho Malebana impressed in the Bantwana’s attack but couldn’t penetrate the Nigerian back line.
Mr Nwobi said that NUSA mobilised massive Nigerian support to the Lucas Moripe Stadium in Pretoria for the Flamingos.
Harmony Chidi sealed Nigeria’s win with a third goal in the 68th minute.
In the 66th minute Peace Effiong utilised an error from substitute goalkeeper Melany Pozo.
Chidi Harmony scored the first goal for Nigeria three minutes into the game.
Flamingos will host Liberia in the return leg scheduled for Friday at the Moshood Abiola National Stadium, Abuja.
Germany pulled off a comeback to beat Nigeria 2-1 on Tuesday evening.
Flamingos will lock horns with Germany in the opening match of the Group B on Tuesday.
