Ishikawa began career in the Nippon Professional Baseball (NPB) league with the Hokkaido Nippon-Ham Fighters in 2013. His debut marked the start of a promising career in Japan's top baseball league. During his tenure with the Fighters from 2013 to 2016, Ishikawa showed potential with his right-handed batting and throwing skills. Although his batting average was not among the highest, he was known for his agility and speed on the field. His time with the Fighters, however, laid the foundation for his professional growth in the NPB league.
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