This female tennis player has never won a Slam, but Svitolina's balance sheet is a win on its own. Elina Svitolina has racked up around $12 million, mostly from prize money.

Measuring greatness in women’s tennis takes more than counting trophies. It revolves around who dominated their era, who pushed the sport forward, and who made winning look inevitable.

When it comes to finding an American woman ready to win her home Grand Slam at the U.S. Open, the nation’s tennis fans don’t ...