Fredy Montero converted a penalty kick in first-half stoppage time in Mexico on Thursday as Seattle Sounders finished with a 1-1 tie against Leon and advanced to the semifinals of the CONCACAF Champions League.
The Sounders emerged with a 4-1 victory in the two-leg, total-goal series, as Seattle built a 3-0 edge in its home leg on March 8.
Seattle will meet reigning Major League Soccer champion New York City FC in the semifinals next month. The other semifinal will feature two Mexican teams, Cruz Azul and Pumas.
Near the end of the first half on Thursday, Seattle's Joao Paulo was impeded by William Tesillo inside the penalty area. Montero blasted the spot kick into the top right corner.
Fidel Ambriz allowed Leon to salvage a tie when he scored with a header from David Ramirez's cross late on.