Clemen made 22 appearances for the Jackrabbits in 2015. He pitched 39.1 innings of relief while striking out 47 batters with a 3.20 ERA. He only walked 12 batters while hitting one. Opposing batters only had a batting average of .255 versus Clemen in 2015.

Before South Dakota State: Anchored a strong Dowling Catholic High School pitching staff during the 2012 regular season, posting a 9-0 record with a 0.87 ERA. He earned Class 4A first-team all-state honors from the Iowa Newspaper Association. Pitched for Dowling Catholic’s state title team in 2011. Was a member of the state championship football team in the fall of 2010.