I will dedicate this win to my wife, Singh said. Kudrat Singh, recovering in a Toyko hospital, urged her husband to play the event.
Singh won by two strokes, closing with a 4-under 66 at Tokyo Yomiuri for a 12-under 268 total. He also won the 2006 tournament.
Last month, Singh beat Ernie Els and Padraig Harrington by a stroke in the Singapore Open to win his second Asian Tour money title. Singh also won the European Tours Bank Austria Open in June and the Japanese Tours Sega Sammy Cup in July.
Australias Brendan Jones, the 2007 winner, shot a 64 to tie for second with New Zealands David Smail (66) and Japans Taichi Teshima (68).
Ryo Ishikawa, the 17-year-old Japanese star who last weekend became the youngest player in Japanese Tour history to reach $1 million in a season, closed with a 70 to tie for fifth with Toshinori Muto at 8 under .
I couldnt really enjoy todays round, Ishikawa said. I gave it my best to the final hole but came up short. Still, its been an unbelievable year for me.