After the 21-year-old converted match point the Canadian team celebrated wildly on court in front of their jubilant fans.
It was then over to Fernandez who duly claimed her fourth singles win of the week by outclassing Paolini.
Canada's team will receive $2.4 million in prize money -- a record for the women's team event formerly known as the Fed Cup.
"Congratulations to Canada for capturing their first Billie Jean King Cup title," King said.
Canada are the 13th nation to win the Billie Jean King Cup and the second new champions in two years following Switzerland’s triumph in Glasgow 12 months ago.
Persons:
Billie Jean King, Marina Stakusic, Italy's Martina Trevisan, Marcelo Del Pozo, Leylah Fernandez, Jasmine Paolini, Heidi El Tabakh, Martina Trevisan, Trevisan, Stakusic, Fernandez, outclassing Paolini, Marketa Vondrousova, Gabriela Dabrowski, Barbora Krejcikova, Katerina Siniakova, American King, King, Martyn Herman, Hugh Lawson, Ken Ferris
Organizations:
La, U.S ., WTA, Wimbledon, Fed, Billie Jean King Cup, Thomson
Locations:
Seville, Spain, SEVILLE, Canada, Italy, Czech Republic, Czech, American, Glasgow