The Women's Professional Baseball League will launch next year, becoming the United States' first pro women's baseball circuit in 70 years. But what makes a pro league successful? Analysts say mainstream recognition is key for sustainability and profitability. Good salaries and financial incentives should attract big-name players, who in turn draw big crowds and maybe even TV deals. Streaming services have also opened up new pathways to reach fans, as well as special tours and strong branding. At least eight women's pro leagues have launched in the past three years including Unrivaled, a 3-on-3 women's basketball league based in Miami.

When Justine Siegal and Keith Stein envisioned the United States' first professional women's baseball league in 70 years, they wanted to do it right. So th

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