Major League Baseball is investing in Athletes Unlimited to support its softball league that will debut next month, marking the first time MLB will have a comprehensive partnership with a professional women’s sports league. MLB said Thursday it was making a strategic investment in the Athletes Unlimited Softball League of an undisclosed amount for operational costs and a commitment to help it gain visibility in various ways, including assistance with content, marketing and sales, events, distribution, editorial, and digital and social platforms. That includes marketing the AUSL and its athletes during MLB’s All-Star Game and throughout the postseason.