Each day during the U.S. Open, we'll publish a photo gallery of on-site images from Anita Aguilar. Steve Tignor will provide the captions, but he's also looking for your best work. Can you beat his caption of the above photo? Write yours in the comments below, or email Steve at stignor@tennismagazine.com, and he'll announce the winner in tomorrow's gallery.

Day 4 at the Open started calmly, with a flurry of women’s matches that had been held over from the previous evening. It ended in something close to chaos, as Flushing Meadows was temporarily relocated to the Seine. Here’s a rundown in pictures of what happened Thursday, with a heavy dose of two usual suspects, and classic subjects: Fed and La Monf:

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

The Open, even in its slow moments, is nothing if not colorful.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Canada’s Eugenie Bouchard acknowledges defeat. She put up a good fight against Angelique Kerber, but succumbed in three.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Christina McHale always ups her game when she’s home in New York. After slumping all year, she’s into the third round.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

“So, why, again, do they make us get into the Sphinx position?”

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Yes, Roger Federer can put a tennis ball on a string.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

And he can still get airborne.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

And what would a trip to New York be without a tweener?

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Great fans, bad gang.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

When it comes to elegant tennis players, maybe only Maria Kirilenko can follow the Fed.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

But the future Mrs. Ovechkin showed some fire yesterday, too, as she advanced to the third round. She’ll play Simona Halep next.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Why hasn’t Michelle Larcher de Brito been more successful? This may be a clue.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Cult hero Frank Dancevic lost the Awesome Hair Bowl to Tommy Robredo.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

New York was ready to pull Sam Querrey through, but the American, who said he got nervous on "pressure points," wasn't ready to be pulled.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

Vicky Duval was right to look concerned last night. The 17-year-old’s attention-grabbing Open came to an end in the second round. But remember those glasses...

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

You know it’s a big night at the Open when no one even knows that Rafael Nadal played a match. He won easily, and then shared a giggle with his team.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

All eyes were on La Monf, as the Frenchman took over New York for a couple of hours.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

“If I win or lose, who cares?” Monfils said afterward. But he did his best to entertain.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

The man who could have been the Tiger Woods of tennis...

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

John Isner said he was “disappointed” that the audience rooted for his French opponent. What mattered, though, was John’s response—he fought back.

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

The day ended as it should have: With a Wave.

Caption Contest:

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Photos from Flushing Meadows: Day 4

Photos from Flushing Meadows: Day 4

brothaman notches his second victory of the week:

"But how will the soil support the weight of the roof?"