The 19-year-old put his side ahead in the 12th minute before Wason Renteria levelled after half an hour and the Brazilian side held on to progress despite Neymar missing a late penalty. Santos will now meet either Jaguares of Mexico or Paraguay's Cerro Porteno.
Velez Sarsfield also reached the last four after Maximiliano Moralez scored twice as the Argentinian side beat Libertad of Paraguay 4-2 on the night, 7-2 on aggregate. They will now take on the winner of the quarter-final between Uruguay's Penarol and Chile's Universidad Catolica.
"This team have what it takes to clinch important goals," Moralez told Fox Sports. "We must not go crazy and feel overconfident. We should think game by game. Our next rivals will be as difficult as the past ones and we have to be focused."