Eugenie Bouchard advanced to the third round of the US Open with a 6-3, 6-7 (2), 6-3 win over Polona Hercog of Slovenia.

Bouchard had 14 break-point chances against Hercog, converting seven of them. But she also saved just four of the nine break points she faced.

After dropping the second set to Hercog, the 21-year-old felt she needed to increase her aggressiveness in the final set to close out the match.

"I tried to put on more pressure because I felt like that's when I did the best," said Bouchard. "Try to attack her backhand a bit more, put more pressure on the second serve, but I think in general I actually returned well on the first and second."

The Westmount, Que., native, who has struggled through much of the year after a fantastic 2014 season, has appeared more confident in her first two matches in New York as she looks to end 2015 on a high note.

"I had so much confidence last year," said Bouchard. "This year, after losing a couple matches, I felt like that went down a little bit, even though it shouldn't have. I feel like I'm rebuilding that. It's definitely helping me on the court."

Bouchard will face Slovakia's Dominika Cibulkova in the third round.