The oldest player remaining in the fourth quarter of the women's draw, 29-year-old Lesia Tsurenko, is having one of the best seasons of her career in 2018 – and it's continued in Flushing Meadows.
The Ukrainian No. 2 is into a Slam quarterfinal for the first time - on better than her round of 16 finish in Flushing Meadows in 2016 - after beating Czech teenager Marketa Vondrousova on Monday.
READ MORE: Tsurenko makes first-ever US Open quarterfinal
Here are five fast facts on the Ukrainian:
She's won a WTA title in each of the past four years. The Ukrainian owns four career WTA singles titles, having won one in each season since 2015.
She won her maiden title in Istanbul, Turkey in 2015, and followed that up with wins in Guangzhou, China in 2016 and in Acapulco, Mexico in each of the last two years.
Tsurenko credited the "good experience of playing night matches with high humidity" in Acapulco with helping her to a second round upset of Caroline Wozniacki, earlier in the fortnight.
She's had success on American hard courts in previous seasons. Though she came into the US Open unseeded, with a world ranking of No. 36, Tsurenko has built herself a reputation of winning in the United States.
She reached the quarterfinals of the Western & Southern Open in Cincinnati in the leadup to this year's event, upsetting defending champion Garbiñe Muguruza along the way, but that was not her first taste of winning on U.S. soil.
The Ukrainian announced herself on tour in Indian Wells in 2015, where she came through the qualifying draw and upset two Top 10 players en route to the quarterfinals.
In addition, she reached the semifinals at the Connecitcut Open in New Haven during the US Open Series that season, and she also reached the quarterfinals on her debut at the Series event in Stanford last year.
She scored her first win over a player ranked in the Top 5 at this tournament. Though she owned six career wins over Top 10 players prior to this event, Tsurenko had been winless in nine previous matches against players ranked No. 5 or higher.
That changed on Thursday night against Wozniacki, where she lost just six games en route to defeating this year's Australian Open champion in Louis Armstrong Stadium.
"My win against Garbiñe Muguruza in Cincinnati and some victories there gave me the confidence that I can play well. I was here early. I prepared well. I think I was completely ready for this tournament," she said after the victory.
"The game plan [was] to play consistent, to play patient, to choose the good ball to attack and maybe to go for a volley or just to play a winner. I think it was a good game plan. It worked today. I was really brave today."
She's made history for her country in Flushing. This year, Tsurenko and Elina Svitolina each advanced to the round of 16, which was a first for Ukraine in the Open era.
Should she score a victory today in the Grandstand, she would be the third Ukrainian woman to reach a Slam quarterfinal, along with Svitolina and Kateryna Bondarenko.
Some people call her the Queen...of Olive Oil. If you didn't yet know her for her tennis on court, you might recognize Tsurenko from off the court.
The Ukrainian is sponsored by Colavita olive oil, and the brand's 60-second commercial featuring her often airs, stateside, on the Tennis Channel.
“It was a great experience for me. We filmed it in Rome, and I didn’t even know what we were going to do. They told me that the video would be for the United States and Canada. I was like, ‘Wow, that’s so great!’ I really like their product, and they’re some of the greatest people ever," she told the WTA after winning again in Acapulco in March.
"A lot of people called me the Queen of Olive Oil. That was very enjoyable for me, because that means a lot of people saw me on TV, and I became more recognizable."
