Matchday 4 of the MLS season begins on Saturday with eight games on the schedule. Two more will follow on Sunday. With 58 players on international duty, coaches will have to rotate accordingly this weekend.

The first Cascadia Cup match of the season between the Portland Timbers and Vancouver Whitecaps at BC Place is the highlight of Saturday's games.

Elsewhere, D.C. United and the LA Galaxy square off, while FC Dallas meet the Seattle Sounders in a rematch of last year's Western Conference semifinals. 

Here are the keys to every match in MLS this weekend.

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