Jamie Sinclair/Rich Ruohonen (Chaska, MN) run at the 2021 Curve US Open of Curling Mixed Doubles came to an end in the semifinals with a 7-3 loss to Tabitha Peterson/Joe Polo (Chaska, MN). of the 2021 Curve US Open of Curling Mixed Doubles in Blaine, Minnesota, United States;
 
Sinclair/Ruohonen finished 4-0 in the 14-team qualifying round. . In their opening game, Sinclair/Ruohonen defeated Susana Cole/Tijani Cole (Accra, NGR) 10-2, then won 6-3 against Ann Podoll/Nathan Parry (Fargo, ND) and 10-6 against Aileen Geving/Luc Violette (Duluth, MN). Sinclair/Ruohonen won 7-3 against Christine McMakin/Riley Fenson (Bemidji, MN) in their final qualifying round match.
 
Sinclair/Ruohonen ranks 198th overall on the Year-to-Date rankings with 0.000 points earned so far this season.