The women's U.S. Open final sold out before the men's because Serena Williams is on fire

For what's believed to be the first time in history, the U.S. Open women's singles final sold out before the men's singles final, ESPN reports.

There's one reason why: Serena Williams. A victory for the tennis goddess and upcoming tournament's top seed would make history by completing her 2015 Grand Slam sweep, a feat no woman has accomplished since Steffi Graf in 1988. Williams has 21 Slam titles to her name, just three fewer than record holder Margaret Court.

Seats for the women's final, which doesn't even sell out some years, are trading at three times their usual value, according to the United States Tennis Association.

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Open play begins Monday.