Oman were held to a goalless draw by Kuwait in their opening match in Group One.
But striker Hassan Rabea was an inspirational force for the Omanis as he netted a hat-trick over 10-man Iraq.
Rabea gave Oman the lead in front of their home fans when he fired home a pass from Fawzi Bashir, following Khalifa Ayel’s free-kick.
Iraq were forced to field a weakened side – missing Noor Sabri and Haitham Kadhem through suspension.
Midfielder Nashat Akram and Bassim Abbas were ruled out through injury.
The 2007 Asian Champions missed an opportunity to draw level as Hawar Mulla Mohamad’s penalty was saved by Oman keeper Ali Al Habsi.
In the final minute of the first half, Iraq defender Jassem Gholam was given his marching orders after receiving a second yellow card.
Oman came out firing on all cylinders the second 45 minutes when Imad Al Hosani doubled their lead in the 50th minute, heading home Ismail Al Ajmi’s cross.
10 minutes later, Rabea let fly a powerful shot which Iraq keeper Mohamad Kasid no chance at all to make it 3-0.
Rabea completed his hat-trick and the rout for Oman as he slid past his marker to fire past Kasid in the 80th minute.
In the other match played at the Sultan Qaboos Complex Stadium on Wednesday, Mesaed Nada’s 38th minute free-kick gave Kuwait a 1-0 victory over Bahrain.
Following wins for Oman and Kuwait, the two teams are tied at the top of Group One.