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TOKYO, JAPAN - FEBRUARY 4: Princess Mako of Akishino of Japan attends the doubles match between Vice-President of Japan Tennis Association Koji Watanabe and JTA President Nobuo Kuroyanagi on day 2 of the Davis Cup World Group first round tie between Japan and France at Ariake Coliseum (Ariake Colosseum) on February 4, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

TOKYO, JAPAN - FEBRUARY 4: Princess Mako of Akishino of Japan attends the doubles match between Vice-President of Japan Tennis Association Koji Watanabe and JTA President Nobuo Kuroyanagi on day 2 of the Davis Cup World Group first round tie between Japan and France at Ariake Coliseum (Ariake Colosseum) on February 4, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

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TOKYO, JAPAN - FEBRUARY 4: Princess Mako of Akishino of Japan attends the doubles match on day 2 of the Davis Cup World Group first round tie between Japan and France at Ariake Coliseum (Ariake Colosseum) on February 4, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

TOKYO, JAPAN - FEBRUARY 4: Princess Mako of Akishino of Japan attends the doubles match on day 2 of the Davis Cup World Group first round tie between Japan and France at Ariake Coliseum (Ariake Colosseum) on February 4, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

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TOKYO, JAPAN - FEBRUARY 2: Princess Mako of Akishino of Japan attends the official draw ceremony ahead of the World Group Davis Cup tie between Japan and France at Ariake Colosseum on February 2, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

TOKYO, JAPAN - FEBRUARY 2: Princess Mako of Akishino of Japan attends the official draw ceremony ahead of the World Group Davis Cup tie between Japan and France at Ariake Colosseum on February 2, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

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TOKYO, JAPAN - FEBRUARY 2: Princess Mako of Akishino of Japan helps ITF supervisor Soeren Friemel of Germany to carry out the official draw ceremony ahead of the World Group Davis Cup tie between Japan and France at Ariake Colosseum on February 2, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

TOKYO, JAPAN - FEBRUARY 2: Princess Mako of Akishino of Japan helps ITF supervisor Soeren Friemel of Germany to carry out the official draw ceremony ahead of the World Group Davis Cup tie between Japan and France at Ariake Colosseum on February 2, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

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TOKYO, JAPAN - FEBRUARY 2: Princess Mako of Akishino of Japan attends the official draw ceremony ahead of the World Group Davis Cup tie between Japan and France at Ariake Colosseum on February 2, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)

TOKYO, JAPAN - FEBRUARY 2: Princess Mako of Akishino of Japan attends the official draw ceremony ahead of the World Group Davis Cup tie between Japan and France at Ariake Colosseum on February 2, 2017 in Tokyo, Japan. (Photo by Jean Catuffe/Getty Images)