Johanna Konta has reached the third round of a Grand Slam event for the first time so she didn't really mind having to work overtime to get there.

Konta's second-round victory Thursday against No. 9 seed Garbiñe Muguruza set the U.S. Open record for longest women's singles match: 3 hours, 23 minutes.

"I'm very tired right now, but you know, it's a good tired," she said. "It just shows I left everything out there."

Johanna Konta

Konta, 24, won the first set 7-6 and dropped the second set 6-7. Those two sets alone took so long that closing out the match 6-2 still easily surpassed the previous record of 3 hours, 16 minutes, set by Samantha Stosur and Nadia Petrova in 2011.

"I noticed after the first set it was incredibly long," Konta says. "I had a couple glances of the clock and I'm like, 'Oh, OK. We have been here for a while.'"

Johanna Konta And Garbiñe Muguruza

The tennis gods just keep shining on Konta. After losing in the first round at Wimbledon 6-2, 6-2 to Maria Sharapova at Wimbledon, Konta is undfeated.

The Brit won ten straight matches to win ITF titles in Canada (Granby and Vancouver). At U.S. Open qualifying, she won three straight to earn a bid to the main draw. Konta followed that with a first-round win over American Louisa Chirico and the marathon victory against Muguruza in temperatures that reached the mid-90s.

She is asked if it has really been 15 straight wins since Wimbledon in June.

"You guys keep updating me with how that's going, so thank you," she said with a laugh.

Although the ITF is a tier below the WTA, Konta's streak is impressive, considering it now includes five matches in Flushing Meadows. The competition keeps getting harder, but Konta, the world No. 97, keeps adjusting.

"Every opponent is a new opponent," she said. "Trust me, they don't give a crap how many matches I have won.

"I'm happy I have been able to stay healthy enough to be competing as much as I have. I am going to lose sooner or later. I'm not invincible. I'm no Serena Williams."

Johanna Konta Serve

Well, even Serena Williams doesn't have a 15-match win streak. (OK, maybe she is on a seven-match win streak and 50-2 this season, but that is still not 15 straight.)

Konta paid her dues. In 2012, she made her Grand Slam debut at Wimbledon as a wild card. She lost to American Christina McHale in three sets. Then at the U.S. Open, she beat Tímea Babos of Hungary for her only Grand Slam win until this week.

Going into Flushing, Konta had only played in five majors since 2012, losing in the first round in all five. In six other instances, she failed to qualify. Her career high rank of No. 89 came in July 2014.

"I'm happy I get to be in the third round of the U.S. Open," she said in U.S. Open Interview Room 1, which is usually reserved for the biggest names. "There are not that many people in the world that can say they have done that. I'm very humbled about this experience and enjoying every second of it. I'm also ambitious and I'm by no means content."

On Saturday, Konta will have another chance to keep pushing her stay across the pond. She will battle No. 18 seed Andrea Petkovic of Germany.

But first, an ice bath and rest would not hurt.

"I will be absolutely fine by tomorrow," she says. "[I need a] good night's sleep. This is what we train for. This is why we put the hours in that we do. This is not my first rodeo with a three-and-a-half hour match."

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-- Follow Jeffrey Eisenband on Twitter @JeffEisenband.