The Raiders shut out the Swift Current Broncos 6-0 on Tuesday to win the Scotty Munro Memorial Trophy for the second time in team history.
The only other time the Raiders won the regular season championship was in the 1984-85 season, when they also won the Memorial Cup.
Justin Nachbaur scored twice, while Dante Hannoun added a goal and two assists and Aliaksei Protas had a goal and an assist.
Sergei Sapego and Eric Pearce also scored for Prince Albert (51-9-2-2), the second-ranked team in the CHL.
Ian Scott made 24 saves for his sixth shutout of the season, placing him in a three-way tie with Luke Siemens and Rejean Beauchemin for the most in a single season in Raider history.
Riley Lamb had a busy night in net for Swift Current (10-46-4-2), stopping 33 of 39 shots he faced.
The two teams meet again on Friday in Prince Albert.
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