Dinara Safina proved too strong for fifth seed Svetlana Kuznetsova as she captured the Toray Pan Pacific Open crown on Sunday.
Safina cruised to a 6-1 6-3 victory, hitting 29 winners against her Russian compatriot in a match which lasted one hour and 18 minutes.
Fourth seed Safina won 81 percent of her first-serve points. She also saved two of three break points, while breaking Kuznetsova five times.
"Playing Svetlana today, I knew I had to take my chances and be aggressive from the beginning, and it worked," Safina said.
"My coach told me to stick to my game and it has worked. It has all been coming together.
"It's always nice to get a trophy, but the one here at the Toray Pan Pacific Open is very pretty and unique."
Kuznetsova admitted she was beaten by the better player in Tokyo.
"I'm disappointed I lost in the final, but I have to stay positive because I had a good week in Tokyo," she said.
"Reaching the final was very important for my confidence. And Dinara played really well; she was the favourite going into this final and she delivered.
"She has been one of the best players since mid-season - she's fresher, more confident and an overall better player than in previous years."
Safina has been in stunning form of late, winning 41 of her last 46 matches and claiming four titles this season in Berlin, Los Angeles, Montreal and now Tokyo.
She also reached the French Open final in May and won a silver medal at last month's Olympic Games in Beijing.