Lee cruises through to Japan badminton final
The top seed and defending champion whipped the world bronze medallist 21-10, 21-5 in 29 minutes in their semi-final at the Tokyo Metropolitan Gymnasium.
Lee will play the seventh seed and hometown favourite Kenichi Tago on Sunday, hoping to lift a record fourth Japan Open title.
Tago beat China's Gao Huan 21-12, 21-12 in the other semi-final.
On Thursday, Rashid Sidek tendered his resignation as Malaysia's national singles coach, according to press reports from Kuala Lumpur.
Rashid -- who was not in Tokyo -- reportedly said he was frustrated and disappointed with the Badminton Association of Malaysia (BAM) over its treatment of coaches.
"Before I left Malaysia I was aware of various issues concerning the coaches," Lee said through an interpreter after his semi-final win.
"But I am an athlete and for now I want to concentrate on my game and win," said the 30-year-old, who was stretchered off with cramp and dehydration in the world championship final against his Chinese archrival Lin Dan last month.
Asked how he felt about the BAM, Lee said: "As an athlete, it may be impossible for me to change anything about the association.
"After going home, I will consult everyone and think if I should make any decision."
Lee has not lost a single game in reaching the final, while second seed Chen Long of China crashed out in the first round.
Lee jumped to a 7-0 lead in the first game against Nguyen and never looked back, although the Vietnamese came as close as 17-9 at one point,
In the second game Lee scored 10 straight points to 14-2, dazzling with smashes and net kills. After yielding a few points, he finished Nguyen off by returning his smash close inside the baseline.
"Nguyen is a kind of player who can return wherever you hit so I kept on hitting patiently and went all out for any good chance I found," Lee said.
An all-Japanese women's final was set up after Akane Yamaguchi beat Taiwan's Tai Tzu Ying 26-24, 21-14 and Shizuka Uchida shocked fourth seed Wang Yihan of China.