Matt Dunstone (Regina, SK) run at the 2021 Tim Hortons Brier came to an end in the semifinals with a 6-5 loss to Brendan Bottcher (Edmonton, AB). of the 2021 Tim Hortons Brier in Calgary, Alberta;
 
Dunstone finished 9-3 in the 0-team qualifying round. . In their opening game, Dunstone defeated Peter Mackey (Iqaluit, NU) 10-2, then went on to lose 6-3 against John Epping (Toronto, ON). Dunstone responded with a 6-3 win over Greg Smith (St. John's, NL). Dunstone won 6-5 against Brad Gushue (St. John's, NL), then won 9-6 against Michael Fournier (Montreal, QC). Dunstone went on to lose 9-2 against Kevin Koe (Calgary, AB). Dunstone responded with a 10-5 win over Eddie MacKenzie (Crapaud, PEI). Dunstone won 7-5 against Scott McDonald (Halifax, NS). Dunstone went on to lose 8-5 against Wayne Middaugh (Penetanguishene, ON). Dunstone responded with a 8-7 win over Bottcher. Dunstone won 5-4 against Brad Jacobs (Sault Ste Marie, NONT), then won 9-6 against Jason Gunnlaugson (Winnipeg, MB) in their final qualifying round match.
 
Dunstone ranks 229th overall on the Year-to-Date rankings with 0.000 points earned so far this season.