Kaori Matsumoto and Ai Shishime won their respective weight categories Friday, giving Japan two gold medals on the opening day of the Judo Grand Prix.

London Olympic gold medalist Matsumoto took the 57-kg title with an ippon victory over her French foe Helene Receveaux at Mitsubishi Electric Halle, winning three of four matches using her trademark groundwork techniques.

“I’ve really worked hard on my groundwork, and I’m seeing results,” said Matsumoto.

In the women’s 52-kg division, Teikyo University student Shishime beat Olympic bronze medalist Priscilla Gneto of France by scoring a yusei decision.

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