In two league matches over the weekend, RPI sophomore Sebastian Castillo-Sanchez was undefeated while playing No. 1 as the Engineers went 2-0. Against Vassar on Saturday, Castillo-Sanchez won 7-6 (3), 6-2 as RPI prevailed, 7-2. The next day against Ithaca, he won 6-1, 6-1, to help the team win, 8-1.