When it comes to playing Sporting KC, the Sounders know what to expect: Peter Vermes has his squad prepared for a hard-nosed, physical battle. Since 2009, 15 of the 17 MLS meetings between the two sides have been decided by one goal or fewer.
When it comes to the weather, though, it's a completely different story. Of the eight matches the Sounders have played in Kansas City, the weather has been all over the place. In their first meeting in 2009, it was 49 degrees. In 2016, it was 95 degrees. This Sunday, it could be even more extreme.