Serena Williams, of the United States, waves to fans after...

Serena Williams, of the United States, waves to fans after winning her match with Madison Keys, also of the United States, during the fourth round of the U.S. Open tennis tournament, Sept. 6, 2015, in New York. Credit: AP / Charles Krupa

Luke Lendler, 9, likes Madison Keys. "But I really want to see Serena Williams make history," said the boy who drove up from Philadelphia Sunday with his parents.

He and thousands of other fans, many from Long Island, came out to the U.S. Open in Flushing Meadows, where Williams took center court and moved one step closer to entering the record books with a win over Keys. It would be Williams' fifth Grand Slam win in a row and she'd be the first player to win four majors in a calendar year since 1988.

Williams, 33, beat Keys in straight sets, 6-3, 6-3. Now she'll face her sister, Venus Williams, in the quarterfinals.

Before the match, as an international crowd streamed from the No. 7 subway and Long Island Rail Road platform, staff on bullhorns blared instructions. No backpacks. No aerosol. No selfie sticks.

"They're a hazard," explained the man on the microphone, from Lindenhurst, who said he couldn't give his name.

As Williams' match got under way, fans stopped to watch the big screen on the front of Arthur Ashe Stadium.

Amy Madmon, of the Five Towns area, had brought her 9-year-old nephew Matthew, to watch. She was rooting for a good match. Matthew was a Serena fan. "It's a player he recognizes," she said.

Jonathan Lippin, 62, of Port Washington, brought his son Brian, 13, to the Open for the fifth time.

"It's a happening," Lippin said. "It's the World's Fair of tennis."

Lisa Helfer, 41, of Manhattan, comes every year, and is reminded of tournaments that her dad took her to as a child. "I just like the whole atmosphere," she said after taking a selfie -- without a stick -- with her friend in front of the stadium fountains.

"It's Serena," said Vickie Peaire, 53, from North Carolina, of the day's biggest draw. "I'm so excited I can't stand it!"

She, though, cheered for Keys, a 20-year-old American, ranked 19th in the world and second in the U.S. behind Serena Williams. "I always root for the young up-and-coming underdog."

For the first time, the women's final this year sold out before the men's. Through its first five days, 301,058 fans came through the gates and there were sellouts to all the night sessions, according to Open officials. It is the first time since 2009 that attendance at the U.S. Open exceeded 300,000 through the tournament's first five days.

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