In two matches last week, RPI senior Sebastian Castillo-Sanchez won at No. 1 against both opponents as the Engineers went 1-1. In a 5-4 loss at No. 33 Swarthmore College, he earned a 6-0, 6-0 victory. He then had a 6-4, 7-5 win in a 5-2 team triumph at Division II LeMoyne College.