Jones and her Winnipeg rink scored one point in the eighth end to beat Sigfridsson. Jones won gold at the Sochi Games by defeating Sweden 6-3 in February.
The win moves Jones into a tie for second place at 3-1 with Sigfridsson.
Meanwhile, Scotland's Eve Muirhead and Switzerland's Silvana Tirinzoni stayed unbeaten at 4-0. Muirhead hammered Calgary's Crystal Webster 9-2 while Tirinzoni kept pace with a 7-5 win over Edmonton's Val Sweeting.
Elsewhere, Saskatoon's Stefanie Lawton rolled over Ottawa's Rachel Homan 7-2, and Sherry Middaugh of Coldwater, Ont., beat Julie Hastings of Thornhill, Ont., 8-6.
In men's play, Calgary's Kevin Koe earned a 9-6 win over Brad Gushue of St. John's, N.L.
Koe and Winnipeg's Mike McEwen are tied atop the standings at 3-0.
Scotland's David Murdoch downed Coldwater's Glenn Howard 6-4, Toronto's John Epping beat Switzerland's Sven Michel 6-2 and Olympic gold medallist Brad Jacobs of Sault Ste. Marie, Ont., defeated Sweden's Niklas Edin 7-4.
Competition continues through Sunday at the final Grand Slam of Curling event of the season.Suggest a correction