Sorenstam finished with a 13-under 275 total on the Tokyo Yomiuri Country Club course. She has two victories in six events this season after winning 13 worldwide titles last year.
'It's been a great week in so many ways,' Sorenstam said. 'It was nice to finish with a low score. I just tried to stay focused all day and I was aiming for 15 under.'
The Swedish star will play in the Colonial on May 22-25 in Fort Worth, Texas, where she'll become the first woman to compete on the PGA Tour since Babe Zaharias in the 1945 Los Angeles Open.
'Winning here gives me confidence for the Colonial,' Sorenstam said. 'It's a big challenge and it's going to be a learning experience for me, but I'm excited about the opportunity.
'My main goal is the win the majors. That's my highest priority and if the Colonial helps me achieve that goal that's all the better.'
Six Japanese players tied for second.
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