Canada's Bianca Andreescu sets out for 2nd Grand Slam title at U.S. Open

Four months after returning to action from an extended break, Canadian tennis star Bianca Andreescu says her confidence is peaking heading into the final Grand Slam of the season.

"I know that I can beat any player on tour right now," Andreescu said ahead of the tournament's main draw, which begins Monday in New York. "I just really have to set my mind to it and just be in the right headspace to be honest. Like, I really believe in myself, in my capabilities. My biggest challenge is definitely myself right now.

"I definitely feel more confident right now than I have this whole year, which is so awesome for me to say because last year I was struggling a lot with that. So, coming into this hardcourt swing, I'm feeling so much better."

The 22-year-old Andreescu entered the National Bank Open in Toronto, an event she also won in 2019, having recovered from lower back pain she dealt with at the Mubadala Silicon Valley Classic in San Jose, Calif.

WATCH l Andreescu advances to 2nd round at National Bank Open:

Although her back didn't give her problems in Toronto, the need for recovery time cut into Andreescu's preparation. Then she ran into a different issue in her first-round win over then-No. 9 Daria Kasatkina.

In the 2 1/2 hour two-set win, Andreescu said "she was seeing double" during the tiebreaker in the first round and "felt really dizzy." She was able to push through and said she hoped to build on her perseverance.

After following with a win over France's Alize Cornet, Andreescu eventually fell to China's Zheng Qinwen in the third round.

WATCH | Andreescu bounced by Zheng at National Bank Open:

"When you play higher ranked players and you do well against them, considering my ranking right now, [it] definitely helps,"