In less than three years as a professional, Mayer (12-0, 5 KOs) has become one of the faces of female boxing. She closed out her 2019 campaign last October with a sixth-round stoppage over Alejandra Soledad Zamora. The Los Angeles native is on track for a world title shot this year, but she must defeat Joseph (17-4-2, 10 KOs), a native of Lagos, Nigeria, who is coming off a competitive decision loss to former lightweight champion Delfine Persoon.

Mayer said, “After having two fights canceled because of the COVID-19 pandemic, I am relieved and excited to be back and grateful to Top Rank for getting me back on a card so quickly. I’m not the fighter you last saw in October. I’ve had three camps to peak myself and grow as an athlete. A whole new fighter is stepping in that ring on July 14, so I hope Helen is ready.”