Why the Women's U.S. Open Final Sold Out Before the Men's

Serena Williams is making history for the U.S. open final before she’s even stepped foot on the court.

Williams reportedly helped the women's final sell out before the men's final for the first time ever, according to the United States Tennis Association.

Fortune reports that Williams is hoping to become the first woman to win four major tennis titles: the Australian Open; the French Open; Wimbledon; and the U.S. Open, since Steffi Graf did in 1988.

She also hopes to tie Graf's 22 major titles count, if she wins the U.S. Open final scheduled for September 12.  

The tickets for the U.S. Open are reportedly being sold for more money than usual.

"Ticket resale market tracker TiqIQ says the average listed price on the resale market for the women's final is now $859, versus a men's final average resale ticket price of $897," said ESPN, according to Fortune.

"That $38 difference in resale prices is remarkable considering TiqIQ says the smallest difference in price between the men's and women's finals was in 2012, when the average ticket price for the men's final was $150 more than for the women's final."

The U.S. Open starts Monday and continues through September 13 at the Billie Jean King National Tennis Center in Flushing, Queens.

Get to know U.S. tennis champion and MAKER Billie Jean King by watching her MAKERS video above.

NEXT: Serena Williams Gears Up for the U.S. Open »

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Photo Credit: AP Photo/Kathy Willens