|Previous College:||Colegio Objetivo|
2012 (Freshman): Concluded freshman season with a 4-8 record in singles ... He played at No. 1 singles all year ... Picked up 6-4, 6-3 win over then nationally 30th-ranked Bernardo Fernandes of Augusta State on March 27 ... Owned an 8-6 overall record in doubles with three different partners ... Was 5-5 in doubles with Lucas Gobbi.
Colegio Objetivo: Ranked No. 1 in Brazil for his age during high school career ... Finished in second place in prestigious South American Tennis Tournament.
Personal: Guilherme is the son of Germano and Valdelice Destefani ... He is undecided on his major.