There are plenty of reasons to think the Seattle Sounders have the deck stacked against them heading into Wednesday's decisive CONCACAF Champions League quarterfinal match against Club America. But the Sounders' task did get a little bit easier after Saturday's Liga MX results.

Not only did Club America prove themselves perfectly mortal -- taking a 4-1 loss to UANL Tigres -- but they also lost midfielder Rubens Sambueza to what the team fears may be a broken collarbone. Sambueza has been one of America's top players this year, logging three goals and an assist in seven appearances. The midfielder also had assists on both of America's goals in the first leg against the Sounders, picking out Darwin Quintero with a long ball over the top for the first goal and looping a perfect cross to Oribe Peralta on the second.

For the second straight league game, America was also reduced to nine players. This time, it was defender Pablo Augilar and midfielder William da Silva who were ejected. Aguilar played 73 minutes, while da Silva didn't get ejected until second half stoppage time.

Assuming America uses the best lineup they have available, three of their four starting defenders will be starting their third match in eight days.