Swiatek is the French Open champion
The 22-year-old was in medical temper as Pegula struggled to search out her vary in a match lasting simply 59 minutes.
It’s the first time Iga Swiatek has received the WTA Finals event.
The ultimate occurred a day late on Monday following unhealthy climate on the occasion however was performed out in sunshine on the venue in Mexico.
Swiatek was shortly out of the blocks and broke within the fourth recreation to take a 3-1 lead earlier than racing away to assert the primary set in 27 minutes.
It was the primary set both participant had dropped on the occasion and Pegula, the world quantity 5, misplaced her serve for a 3rd time within the first recreation of the second set.
Swiatek was overwhelming her rival and broke to like to go 3-0 up on the way in which to securing victory.