The third-seeded Sounders will visit the Monterrey area to meet sixth-seeded Tigres in the first match of their aggregate-score series. The second game will be played at CenturyLink Field.
Other pairings will be No. 1 Monterrey vs. No. 8 Xelaju; No. 4 Los Angeles vs. No. 5 Herediano; and No. 2 Santos Laguna vs. No. 7 Houston.
"Playing a team from Mexico, at least we're away first and home second, which is a plus, and we're avoiding for sure the big two that have done very well in the last couple years in this competition -- Monterrey especially," Sounders coach Sigi Schmid said yesterday before the final pairings were set. "All we can control is our own destiny, and then the rest is up to them."
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If the Sounders advance, they would face the Santos-Houston winner in the semifinals.
The quarterfinal pairings were settled by the final group matches played tonight. Los Angeles defeated Metapan (El Salvador), 3-2. Chivas de Guadalajara (Mexico) beat Xelaju, 2-1; but the losing side advanced on the away-goals tie-breaker.