Top seed Swiatek, the 2022 and 2023 champion at the German clay-court tournament, saw off former US Open champion Raducanu 7-6 (7/2), 6-3.
Swiatek is the first player to win three straight titles at the same WTA event since Serena Williams completed a Miami Open hat-trick from 2013-15.
Top seed Iga Swiatek crashed out of the Australian Open on Saturday, losing 3-6, 6-3, 6-4 to Czech teenager Linda Noskova in the third round as her bid for a maiden Melbourne Park title and fifth Grand Slam trophy fell apart.
Iga Swiatek came back from the brink to beat unseeded American Danielle Collins in the second round of the Australian Open on Thursday, extending her winning run to 18 matches.
She enters the opening Grand Slam of the year as favourite.
Defending champion Iga Swiatek was sent crashing out of the US Open on Sunday, losing in three sets to Latvia's 20th seed Jelena Ostapenko.
The world number 76 came through 7-5, 6-7 (5/7), 6-2 despite being a break down in both of the first two sets against the reigning US Open and French Open champion
Djokovic took a two sets lead over Hubert Hurkacz in their last 16 clash when play was halted ahead of a locally agreed 11pm night-time curfew
Poland's Iga Swiatek continued her dominance on Parisian clay with a third French Open crown in the last four years, defeating unseeded Czech Karolina Muchova 6-2 5-7 6-4 in a thrilling final to capture her fourth Grand Slam title on Saturday.
Top seed Swiatek, the 2022 and 2023 champion at the German clay-court tournament, saw off former US Open champion Raducanu 7-6 (7/2), 6-3.
Swiatek is the first player to win three straight titles at the same WTA event since Serena Williams completed a Miami Open hat-trick from 2013-15.
Top seed Iga Swiatek crashed out of the Australian Open on Saturday, losing 3-6, 6-3, 6-4 to Czech teenager Linda Noskova in the third round as her bid for a maiden Melbourne Park title and fifth Grand Slam trophy fell apart.
Iga Swiatek came back from the brink to beat unseeded American Danielle Collins in the second round of the Australian Open on Thursday, extending her winning run to 18 matches.
She enters the opening Grand Slam of the year as favourite.
Defending champion Iga Swiatek was sent crashing out of the US Open on Sunday, losing in three sets to Latvia's 20th seed Jelena Ostapenko.
The world number 76 came through 7-5, 6-7 (5/7), 6-2 despite being a break down in both of the first two sets against the reigning US Open and French Open champion
Djokovic took a two sets lead over Hubert Hurkacz in their last 16 clash when play was halted ahead of a locally agreed 11pm night-time curfew
Poland's Iga Swiatek continued her dominance on Parisian clay with a third French Open crown in the last four years, defeating unseeded Czech Karolina Muchova 6-2 5-7 6-4 in a thrilling final to capture her fourth Grand Slam title on Saturday.
Reigning French Open champion Iga Swiatek will attempt to become the first woman to successfully defend the title in Paris in 16 years on Saturday when she faces surprise finalist Karolina Muchova.