Mendoza was teammates with the Slammers’ Jacob Sanchez in 2011 and 2012 at Iowa Wesleyan. He capped a two year career with Iowa Wesleyan by being named a 2nd Team NAIA All-American and the Midwest Collegiate Conference Player of the Year, batting .335 with eight home runs and 45 runs batted in. He led the MCC in four categories, pacing the league in doubles (21), home runs, runs scored (47) and total bases (108). He also was second in the conference in both RBI and slugging percentage (.593) and tied for fifth in hits (61).