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With this win, Kento Momota became the first Japanese player to win the men's singles crown.
The accident came after the dominant Japanese star began his 2020 season in style Sunday with victory over Denmark's Viktor Axelsen in Kuala Lumpur.
The world No. 1 admitted his 'spirit was almost broken' after the accident in January -- hours after he won the Malaysia Masters -- which killed the driver of the vehicle taking him to Kuala Lumpur airport.
The men's clash is a repeat of last year's World Championships final, when Japan's top-ranked Momota defeated Shi.
Men and women badminton players now have their eyes on the Tokyo 2020 Olympics with the 12-month qualification period starting on Monday.
Momota dug deep to fight back from 16-11 behind in the second game to force a decider.
It is the first time that Japan has won both the men's and women's singles titles at the tournament.
The world No. 1 won 21-13, 21-15 to seal a place in the final.
Sindhu will face 2017 winner Nozomi Okuhara of Japan in the summit clash on Sunday.
Momota is the reigning world champion, Asian champion and world number one and he can now add success in badminton's oldest tournament to his glittering CV.
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