REGINA — The Edmonton Elks head to Mosaic Stadium for a date with the Saskatchewan Roughriders on Saturday afternoon to close out the regular season. Saskatchewan clinched a playoff spot with a 16-12 win over the Montreal Alouettes in Week 20. Edmonton downed Winnipeg 35-27 last week and has already secured its spot in the Western Final. The winner takes the season series after the Elks won 36-34 in Week 8 and the Riders came away with a 28-26 victory in Week 9. Here’s three keys to victory for both teams ahead of Saturday’s 3:00 p.m. ET kickoff, which can