Three keys for the Dynamo against the Portland Timbers

Troy Taormina-USA TODAY SportsThe Houston Dynamo will certainly get plenty of attention for Sunday's clash with the Portland Timbers. The game takes place two hours before the Copa America final, so the ESPN audience will gain some pre-Copa viewers. A win would be great for the Dynamo, but that's never an easy thing to do against the Timbers.

Here's what they have to do to pick up the full three points:

1. Clog the midfield

MLS's best chance-creator, Diego Valeri, and arguably the league's best No. 9, Fanendo Adi, play on the same team. That's a scary thought for the rest of MLS, and it's one of the main reasons why the Timbers won their first trophy last season. Valeri floats around midfield…