At the 2017 World Table Tennis Championships held in Düsseldorf, partnering compatriot Maharu Yoshimura in the mixed doubles event, Ishikawa and Yoshimura progressed through to the final, beating the combination of Fang Bo and Petrissa Solja in the semi-finals, and overcame the Taiwanese pair of Chen Chien-an and Cheng I-ching 4–3 to win the first title in this tournament. It was also Japan's first mixed doubles gold medal after 48 years.