Coco Vandeweghe is likely to get some kind of a sanction for racket abuse after she took out all her frustrations on the offending implement on a changeover when she was down 0-5 in the first set of her loss Wednesday to Bethanie Mattek-Sands.

She gave the racket a right old bashing, and the Armstrong Stadium crowd was howling in delight, if not egging her on as she gave it one last crack.

"It was all for them," Vandeweghe said with a laugh later. "I broke a racket, I can't repair it, so I took frustration out on the racket. Everyone saw what happened. I don't need to explain it. I've also seen videos and clips of it. I heard about it from a couple of players in the locker room. Everyone can see it."

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"I was laughing when she was doing it," Mattek-Sands said. "I thought she was done and she just kept going. I was like, 'Go big or go home.' You might as well destroy it."

Keys having her best season

Madison Keys got to set the stage for Serena Williams on Arthur Ashe Stadium court Wednesday, playing the first match. The 20-year-old is having her best Grand Slam season and continued with a convincing 6-1, 6-2 victory over Tereza Smitkova.

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Keys, at No. 19, is the second-highest ranked American in the world behind Williams at No. 1. This season she reached the semifinals at the Australian Open, losing to Williams, the third round at the French and the quarterfinals at Wimbledon.

"I think so far this year it's probably been the best year that I have had," she said. "It hasn't been perfect. There have been some ups and downs, but that is the nature of tennis. I still haven't figured everything out."

She figured that she liked Ashe Stadium quite a bit.

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"It was amazing to play out there," she said. "I don't know if it was the roof now, but it didn't seem as big as I thought it was going to be . . . I thought I played pretty well pretty well, so hopefully I can have many more matches on Ashe." Lucky loser rolls on

Daria Kasatkina of Russia, the qualifying tournament's lucky loser who got into the Open when Maria Sharapova pulled out, moved into the third round with a 6-4, 6-4 win over Ana Konjuh. By making it to the third round she guaranteed herself a paycheck of $120,200. Her career winnings to date: $50,121.