To get to the final, Sweeting had to knock off reigning Scotties champ Rachel Homan Saturday night.
Overton-Clapham was a last minute recruit for this event after Andrea Crawford unexpectedly left the team. She only joined this year as a replacement for Joanne Courtney, who joined Homan's rink.
Sigfridsson had to go through Canada's Jennifer Jones, who beat her in the women's curling final to claim Olympic gold in Sochi.
With the win, Sweeting picked up $23,500 in cash and 12 Rogers Cup points and second place earned Sigfridsson $13,500.