Keiko Aoki is a Japanese retired professional wrestler and professional golfer better known as Bull Nakano . She began competing in All Japan Women's Pro-Wrestling (AJW) as a teenager under the ring name Bull Nakano. As a wrestler she was a villain, who often teamed with her mentor Dump Matsumoto. In Japan, she held several of AJW's singles and tag team championships. After being phased out by the company in the early 1990s, she traveled to North America, where she first competed in Mexico's Consejo Mundial de Lucha Libre (CMLL), becoming its first World Women's Champion. In 1994, she made her way to the World Wrestling Federation (WWF), where she had feuded with Alundra Blayze over the WWF Women's Championship. After holding the title once, she also competed in World Championship Wrestling (WCW). In 1998, Nakano began competing as a professional golfer, and in 2006, she joined a tour with the Ladies Professional Golf Association (LPGA). She was inducted into the Wrestling Observer Newsletter Hall of Fame on 2001 and was inducted into the WWE Hall of Fame in 2024.

All Japan Women's Pro-Wrestling , nicknamed Zenjo was a joshi puroresu promotion established in 1968 by Takashi Matsunaga and his brothers. The group held their first card on June 4 of that year. For close to 33 years it had a TV program on Fuji TV called Women's Professional Wrestling.