QUEBEC CITY, Canada - No.3 seed Monica Puig booked her place in the quarterfinals of the Coupe Banque Nationale présentée par IGA on Wednesday as American Madison Brengle was forced to retire due to injury. 

Puig won nine straight games from 1-5 down in the opening set, and the score stood at 7-5, 3-0 in favor of the Puerto Rican before Brengle retired with a right hand injury.

"It was a bit strange when it started. I knew what I needed to do and I didn't really execute it to the best of my ability," Puig said about the early going.

"I felt like I was forcing a bit too much when I needed to build the point a little bit more. I called my coach out [at 4-1] and he told me some things...and we were pretty much agreeing that I was not doing what I needed to do. I think from 5-1 on, I started to organize myself a little bit more and I played very solid from there on out.

"The most important thing is that I was able to regroup and come back, and fight my way out of that first set. I was a little bit more patient with my strokes...until I found an opportunity to do what I needed to do."

After having not reached a quarterfinal since Monterrey in April, Puig has now reached the last eight or better in two of her last three events.

The Puerto Rican came out of qualifying and reached the semifinals at the Connecticut Open in New Haven prior to the US Open.

"I did a couple of these in New Haven...where I was down all the time and I would come back. I don't want that to become a habit, but it's always good to be on the winning side," she added.

"There's always an opportunity if you continue to fight. I want to fight for every point, for every game."

With No.1 seed Aryna Sabalenka being upset by American Varvara Lepchenko in the first round, Puig and No.2 seed Petra Martic are the highest-seeded player remaining in the field this week.

The pair could be on course for a semifinal match, should Puig get past either No.5 seed Sofia Kenin or Canadian Francoise Abanda in the last eight.

"I just try to focus on each match. I can't really afford to look ahead because if I don't win the match that I'm scheduled to play on this day, I can't get to the next round," Puig said. 

"For me, I prefer to take it one match at a time and focus on what I need to do right now. I have been feeling pretty good these past couple of weeks and I have been playing good tennis, so I just want to continue this progress."