Before this year's U.S. Open, Johanna Konta had played in just eight Grand Slams. She had reached the second round only once, at the 2012 Open.

Konta has never won a WTA Tour title, never made a significant mark of any kind in the game. But after Thursday's second-round win over Garbine Muguruza, the No. 9 seed, Konta has made her mark in the U.S. Open record book.

At three hours, 22 minutes, she played the longest women's match in Open history. Konta won, 7-6 (4), 6-7 (4), 6-2. The first set took 80 minutes to play and the final set, while only eight games, took 56 minutes.

U.S. OpenU.S. Open: Women's results

It was after winning the first set that Konta, a 24-year-old from Britain, realized that her match was dragging on another hot and humid day in Flushing Meadows. "I noticed after the first set -- it was incredibly long, but then after I had a couple glances on the clock -- I'm like, 'Oh, OK, we have been here a while,' " Konta said. "It's difficult with sweating buckets . . . After [I] changed clothes, I mean they literally weighed a lot."

Though she's never won a Tour-level title, Konta is on a roll. Her second-round victory Thursday was her 15th consecutive win. She won two ITF events leading up to the Open, each requiring five victories, then had to win three straight Open qualifying matches to get into the main draw.

Konta was asked if she had heard about American Jack Sock's retirement with severe cramps when he was leading his match.

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"I heard that in the locker room. It's a horrible situation to be in," she said. "I really feel for him."

She then recalled a thought during her draining and dizzying match.

"I had a conscious thought," she said. "Would it be really embarrassing if I just toppled over here?"

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Konta didn't, and goes on to play Andrea Petkovic, the 18th seed, in the third round.

Wozniacki ousted. Petra Cetkovska upset No. 4 seed Caroline Wozniacki, 6-4, 5-7, 7-6 (1) late last night. In other matches, No. 2 seed Simona Halep dispatched Kateryna Bondarenko, 6-3, 6-4. Two-time Open finalist Victoria Azarenka beat Yanina Wickmayer, 7-5, 6-4. Samantha Stosur, the 2011 Open champion, rolled over Evgeniya Rodina, 6-1, 6-1. Stosur will be taking on Sara Errani in the third round. Errani, the dedicated baseline player, had to overcome a lethargic start to beat qualifier Jelena Ostapenko, 0-6, 6-4, 6-3. Sabine Lisicki made easy pickings of Camila Giorgi, 6-4, 6-0.