The biggest tennis title of Leylah Fernandez's career arrived at the D.C. Open on Sunday with the help of a terrific backhand, some superb returning — and energy courtesy of Shake Shack's burgers and fries.

Leylah Fernandez proved her resolve three times over on the way to the DC Open final — in two grueling matches against top-15 players and one against her former doubles partner and good friend, Taylor Townsend.

Canada's Leylah Fernandez defeated Russian Anna Kalinskaya 6-1, 6-2 for her fourth career WTA title at the Citi Open hardcourt tennis tournament on Sunday.