Canada's Leylah Annie Fernandez beat Serbia's Olga Danilovic 7-5, 4-6, 6-4 in the opener of their Billie Jean King Cup playoff tie on Friday.
Fernandez, the top-ranked singles player in the indoor hard-court-tie at No. 72, needed two hours 34 minutes to finish off the 162nd-ranked Danilovic.
The Canadian broke Danilovic in the final game of the match to win.
The 18-year-old Fernandez, from Laval, Que., won six of seven break-point chances. Danilovic was good on just five of 14.
The 230th-ranked Rebecca Marino, from Vancouver, will meet world No. 87 Nina Stojanovic in the second match on Friday.
Reverse singles matches go on Saturday before Canada's Carol Zhao and Sharon Fichman face Danilovic and Aleksandra Krunic in a doubles match.