Canada’s Marina Stakusic is moving on to the quarterfinals of the Guadalajara Open in Mexico.

The Mississauga, Ont., native defeated the tournament top seed, Jelena Ostapenko of Latvia, 6-3, 5-7, 7-6 (0) in the round of 16 on Thursday.

Stakusic faced a 0-4 deficit in the third and final set before rallying to victory.

The 19-year-old won five of the next six games to even it up before exchanging games to force a tiebreaker, where Stakusic took complete control to win the match.

Stakusic had five aces with 17 double faults in the three-hour, four-minute match.

However, she converted eight of her 18 break-point opportunities to help her reach the first WTA quarterfinal match of her career.

WATCH | Stakusic advances to her 1st-ever WTA quarterfinal:

Stakusic was a key part of Canada’s Billie Jean King Cup-winning team last fall, delivering three key victories, including a stunning upset of 43rd-ranked Martina Trevisan in the final against Italy.