Saskatchewan won the best-of-two series 2-0.
The Rush are the reigning NLL champions, winning the Champion's Cup last season before relocating from Edmonton to Saskatoon over the summer.
Mark Matthews scored twice and added five assists for the Rush, while Ben McIntosh and Robert Church had a pair of goals each. Adrian Sorichetti and John LaFontaine also found the back of the net. Goaltender Aaron Bold made 39 saves for the win.
Tyler Digby led Calgary with four goals and Dane Dobbie struck twice. Wesley Berg and Curtis Dickson both scored and added two assists, while Peter McFetridge chipped in as well. Mike Poulin started in net, stopping 36-of-47 shots in 57:19 of work. Frankie Scigliano turned aside the only shot he faced.
Saskatchewan will play the Buffalo Bandits in a best-of-three series for the NLL title starting on May 28.