Following his victory, he became the first Nigerians player to win the tournament.
Quadri beat Antoine Henchard 4-2 in the final of the men’s single in front of a capacity crowd at the stadium.
Henchard, from France, won the first set 13-11 but Quadri drew level in the second set, winning 11-3.
The Frenchman won the third set 11-8 but Quadri took the following two sets 11-7.
The Nigerian number one led for the first time in the fifth set winning 11-5 and sealed the win with an 11-8 win in the sixth set.
The 29-year-old showed a spirit of sportsmanship in the third set when the umpire erroneously awarded a point to him, which Henchard won.
He called the umpire’s attention to it. He was thereafter awarded the Fairplay Award of the competition.