Rosenbaum, Berton lead Men's Cross Country to sixth place finish at NCAA III Great Lakes Regional Championships
The Polar Bears finished in 6th place out of 35 teams scoring 221 points and end their season with a 102-17 record.
As a team, No. 20-ranked Wabash won the meet with 60 points, No. 18 Calvin finished in second place with 79 points and Manchester (Ind.) finished third with 109 points.
Rosenbaum finished in 8th place out of 252 runners in a career-low 25:27.4.
Also posting top 50 finishes for the Polar Bears were senior Mark Berton in 18th place in 25:41.7 and senior Tyler Feitshans in 37th place in 26:08.9.
Rosenbaum and Berton each earn All-Great Lakes Regional honors with top-35 finishes.
Rosenbaum will compete as an individual at next weekend's NCAA Championships by finishing in the top seven among individuals not on teams that qualified for the championships.
Berton could receive a championship bid and compete in next week's meet if both Manchester and Mount Union receive at-large bids as a team on Sunday.
Paul Lewis of Albion (Mich.) won the individual side of the meet in 25:10.0.
The NCAA Division III Championships will take place next Saturday at Hanover, Ind.
8. Nathan Rosenbaum 25:27.4, 18. Mark Berton 25:41.7, 37. Tyler Feitshans 26:08.9, 79. Eric Wymer 26:52.3, 81. Jeff Denny 26:53.0, 85. Evan McKee 26:59.7, 100. Cully Gordon 27:10.8.