Question: Hiroaki Sato fought which Japanese mixed martial artist born on July 21, 1981?
Sentence (from "Hikaru Sato"): Hiroaki Sato (佐藤 弘明 , Satō Hiroaki , born July 8, 1980) is a Japanese professional wrestler and mixed martial artist, better known by the ring name Hikaru Sato (佐藤 光留 , Satō Hikaru ) .
Relevant evidence: No