Paraguay's Guarani drew 0-0 at Argentinian giants Racing Club on Thursday, securing a Copa Libertadores' semifinal in the process thanks to a 1-0 aggregate win.
Racing, the champions of Argentina, needed to score, and spent most of the first half creating and wasting chances.
A red card for keeper Sebastian Saja just before the break hamstrung them, though, even if replacement stopper Nelson Ibanez did keep out Julian Benitez's penalty.
After that Guarani dug in and progressed.
"This was the best game of my life. We are happy that we gave a historic step in this tournament. Now, it is time to celebrate, there is a long way ahead," said man of the match Alfredo Aguilar.
The tournament now stops for the Copa America and will resume with Guarani against River Plate and Inter against Tigres.