In his first season with the Bonnies, Rosencrance was successful as a two-way player, both on the mound and at the plate. He stepped up to bat in 41 games and put up a batting line of .305/.422/.504 with 4 home runs and 26 RBI. Rosencrance also clubbed 14 doubles, scored 20 runs and drew 26 walks. On the mound, Rosencrance went 4-4 in 13 appearances (8 starts) with a 4.09 ERA. Hurling 55 innings, he struck out 45 batters and walked just 17 batters.
Rosencrance transferred to St. Bonaventure after spending seasons with Potomac State College (W.V.) and East Stroudsburg University. While at Potomac State, Rosencrance was named to the NJCAA Region XX All-Tournament team. At Holy Cross, he was named first-team all-Lackawanna, first-team all-region, and Lackawanna League Division 2 Player of the Year.