The U.S. Open women’s singles final has sold out before the men’s, for what is believed to be the first time in the history of the tournament.

From a report from ESPN’s Darren Rovell:

“USTA spokesman Chris Widmaier said ticket records, as with anything, are less reliable over time, but the organization is confident that this is the first time the ticket demand was greater for a women’s final.

In fact, in some years, the women’s final has not even sold out.”

So, why now? Two words: Serena Williams.

If Williams nabs her 22nd singles Grand Slam at the Open, the American superstar will tie Steffi Graf for second most Grand Slam singles titles of all time. She will also become the first woman to win all four Grand Slam titles in one season since Graf did it in 1988.

Really, Williams is on the edge of tennis history, so it makes sense that fans would want to see it.

The U.S. Open kicks off on Monday.

(Thanks to ESPN for sharing.)