Nicholson's home run in the seventh gave the Eagles a 4-2 lead.
Concordia improved to 38-19 and will meet Faulkner in an opening-round game at 8:30 a.m. May 27 in Lewiston. The Eagles have won a program-best 12 games in a row and 20 of their last 22.
Casey, a third baseman, went hitless in four plate appearances, but did have two assists.
In another tournament game Friday, Casey finished with two hits to help the Eagles post a 4-3 win against Cal Baptist. Casey also registered three assists. Against British Columbia, Casey had a hit and scored a run in Concordia's 6-5 win Thursday.
Through Saturday, Casey is batting .282 (40-142) with eight doubles and 26 runs batted in. In 41 games, Casey has scored 21 runs and recorded 91 assists and 33 putouts.
Garrett Salzman (St. Francis High, 2008) junior, Macalester College baseball: Thanks to the torrid hitting of Salzman, Macalester turned in a successful season that included a share of the Minnesota Intercollegiate Athletic Conference crown for the first time since 1950.
Salzman also enjoyed a breakout campaign, winning the conference batting championship and helping the Scots (26-14) advance to the conference tournament. Unfortunately for the Scots, their season came to a close Saturday.
Salzman, a catcher, batted .441 in conference and was selected to the all-conference team. In 18 conference contests, Salzman ranked first in hits (30) and third in on-base percentage (.494). Salzman had one five-hit game and notched 12 multiple-hit games. He had at least three hits in a conference game eight times.
Overall, Salzman batted . 403 (50-124) with two home runs and 22 RBIs. In 35 games, Salzman registered 11 doubles and scored 20 runs.