The 2009 world silver medalist shook off her last two rivals after 39 kilometers and crossed the finish line at Yamashita Park in 2 hours, 23 minutes, 56 seconds.
‘‘I was only thinking about winning,’’ Ozaki said. ‘‘I’m happy I turned in a good time and earned a berth (at the world championships).
‘‘I have a goal of winning a medal at the worlds again and running at an Olympics. I will spare no effort to achieve that goal.’‘
The 29-year-old became the first Japanese female marathoner to qualify for the Aug 27-Sept 4 world championships in Daegu, South Korea.
Japanese compatriot Remi Nakazato finished runner-up with a strong time of 2:24:29 in her only second marathon. She bettered her debut time by 10 minutes.