NEW YORK, NY, USA -- No.15 seed Bianca Andreescu of Canada extended her breakthrough season even further with a 6-3, 7-5 second-round victory over lucky loser Kirsten Flipkens of Belgium at the US Open on Thursday.

"Flipkens is a tricky opponent to play," Andreescu said, in her post-match press conference. "She doesn't give you any rhythm. I'm just really happy with how I managed to deal with what she gave me and with my composure out there."

19-year-old Andreescu started the year outside the Top 100 but has stormed the gates of the Top 15 in the WTA Rankings after winning two prestigious titles on hardcourt at Indian Wells and Toronto. Despite her high ranking, this is the teenager’s first-ever appearance in the third round of a Grand Slam event.

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Andreescu collected her win over World No.110 Flipkens after one hour and 23 minutes of play in front of a large, excited crowd on Court 5. Andreescu said she "loved" the atmosphere: "All I can say is that it's really nice to see Canadians here in New York supporting other Canadians."

The top-ranked Canadian had 27 winners, including six aces, to 18 unforced errors during the clash, and broke Flipkens three times to notch both competitive sets.

"I was feeling really good serving today," Andreescu stated. "My goal was to have a high percentage of first serves because I think I win a lot of the points with my first serves, so I try my best to focus on that, and it really worked today."

Flipkens, a former Top 20 player and a Wimbledon semifinalist in 2013, was seeking her first third-round showing at a major since 2014 Wimbledon. The Belgian nearly matched Andreescu exactly in the ratio of winners to unforced errors (24 to 18) but was only able to convert one of her seven break points in the encounter.

"There aren't many girls out there that like to come to the net as much as [Flipkens] does, so I tried my best to handle that as best as I could," Andreescu added. "I think I did a really good job with that today. I tried to make her play as much as I can."

Andreescu was forced to work hard right from the outset, as Flipkens held three break points in the Canadian’s first service game. Strong clutch serving pulled Andreescu out of that jam as she held for 1-1, and the teenager continued to improve from there, breaking for 3-2 after ending a rally with an error-forcing forehand on break point.

Flipkens held a break point to pull back level in the very next game, but squandered that chance with a long unforced error, and Andreescu eventually held to lead 4-2 with a winning forehand down the line.

Andreescu then used two crosscourt forehands to attain two set points on Flipkens’s serve at 5-3, but the Belgian fended both of those off. The third time was the charm for Andreescu, though, as the teenager earned set point number three via a strong service return, and converted that opportunity with a crosscourt backhand return winner.

After falling behind 0-2, Andreescu leveled the second set at 2-2, as the combatants used all corners of the court to try to out-maneuver the other. Net-rushing Flipkens had a serve-and-volley miscue at 4-3 to give Andreescu two break points, but the Belgian escaped that game with a hold to stay even with the No.15 seed at 4-4.

But Andreescu held through the rest of the set to get to 6-5, where she earned another chance on the Flipkens serve by forcing an error with a fierce forehand, setting up her first match point. Andreescu closed out the match right there, with a backhand crosscourt passing shot for a winner to take Flipkens’s serve and post her best-ever result at a Grand Slam event to date.

In the third round, Andreescu will take on the winner of the Thursday night clash between American Danielle Collins and two-time US Open runner-up Caroline Wozniacki of Denmark, who is seeded No.19 this year.

"I have played Caroline before, so I kind of know what to expect," said Andreescu. "Danielle, I have watched her play many times. I'm for sure going to watch the match tonight and then re-evaluate with my coach tomorrow."

"[Wozniacki] was the first-ever player I beat that was in the Top 10 before," Andreescu added. "I kind of know what to expect, if I play her. I know that she's an incredible fighter. She runs every ball down, and I know that it's not going to be easy. I'm just going to go out there and play my game."