Swiatek was returning to the court after a break of more than one month due to her rib injury. She had also missed the Miami Open and Poland's Billie Jean King Cup Qualifier.
No.2 seeds Coco Gauff and Jessica Pegula on Sunday became the first all-American duo to win the Miami Open doubles title in 22 years after defeating Leylah Fernandez and Taylor Townsend 7-6(6), 6-2 in the final.
Petra Kvitova reached the Miami Open semifinals for the first time in her career after a 6-4, 3-6, 6-3 triumph against No.18 seed Ekaterina Alexandrova on Thursday.