Stampeders 34, Roughriders 22: Bo Levi Mitchell threw for 187 yards and three touchdowns as visiting Calgary led from start to finish against Saskatchewan and remained unbeaten.

Mitchell completed 18-of-24 passes and Terry Williams returned a punt for a touchdown for the Stampeders (6-0), who are off to their best start since 1995. DaVaris Daniels hauled in six passes for 61 yards and a score while Marken Michel and Eric Rogers each made a touchdown catch as Calgary maintained its four-point lead atop of the West Division.

Brandon Bridge was limited to 147 yards on 19-of-29 passing as the Roughriders (3-3) were held without an offensive touchdown. Tobi Antigha returned an interception for a TD and Brett Lauther kicked five field goals for Saskatchewan, which has dropped 11 of its last 12 meetings with Calgary.

Michel hauled in a 41-yard touchdown pass, Williams returned a punt 78 yards for a special-teams score and Rogers made a 15-yard TD grab to help Calgary build a commanding 24-0 lead after one quarter. Antigha brought back an interception 52 yards for a touchdown and Lauther kicked two field goals, including a CFL season-best 56-yarder with 17 seconds left in the second quarter to pull the Roughriders within 24-13 at intermission.

Lauther converted kicks of 48 and 32 yards to close the gap to five points before Mitchell found a wide-open Daniels for a 15-yard touchdown with 3:11 left in the third quarter to end Saskatchewan's run of 19 straight points and give Calgary a 31-19 advantage. Lauther split the uprights from 47 yards out to keep the Roughriders within striking distance at 31-22 before Rene Paredes kicked a 35-yard field goal with 2:21 remaining in the fourth to seal another victory for Calgary.

GAME NOTEBOOK: Calgary RB Don Jackson, who leads the team in rushing yards (442), was a late scratch due to an undisclosed injury. … Saskatchewan DE Charleston Hughes recorded his 106th sack in the second quarter to take sole possession of 10th place on the CFL's all-time list. … Rogers has caught a touchdown pass in four consecutive games. … Calgary improved to 33-8 against West Division rivals since the start of the 2014 season.