Wang eventually wore Abdul down to book an all-Chinese Taipei final, but both players entertained the large crowd with a mix of great attack and innovative defence - especially from the quick-footed Abdul who found new ways to return the shuttle when all looked lost.
"I am very happy to have won this match," Wang said.
"It was a very hard match and my opponent played very well and I did not think I would win the match."
Wang said he had played Hao "three or four times but have only won once, so tomorrow will be very difficult for me."
It will be an all-Japanese women's final today.
Kana Ito was the first to book a spot in the women's singles final at the SkyCity-sponsored tournament, with a surprisingly easy victory over second seed Chi Ya Cheng of Chinese Taipei, who was the only seed left in the draw.
Ito established dominance early and never gave Cheng an easy point, winning 21-13 21-9.
A Grand Prix final is not a new experience for Ito though, so nerves are not likely to play a part in today's final.
"This is my fourth final and I have three wins already in my career. I will be very confident tomorrow but will have to play well if I am to win, but I am confident," she said.
Nozomi Okuhara beat compatriot Ayume Mine 21-13 21-12 in the other semifinal.
The Australians sole representatives left in the tournament booked a place in the women's doubles final with fourth seeds He Tian Tang and Renuga Veeran winning a three-game thriller against Japanese pair Yuki Fukushima and Sayaka Hirota.
The Australians will play Shizuka Matsuo and Mami Naito from Japan after they enjoyed a comfortable straight games win over Chen and Cheng from Chinese Taipei in their semifinal.
The men's doubles final will be between unseeded Selvanus Geh and Kevin Sukamujo (Indonesia) and second seeds Hung Ling Chen and Chia Pin Lu (Chinese Taipei).
