The final spot in the MLS Conference finals will be decided Monday night under the bright lights at CenturyLink Field in Seattle.

The Sounders and FC Dallas drew 1-1 at Toyota Stadium in the first leg Sunday. By scoring an away goal, Seattle has the upper hand in the Conference semifinal series. 

That advantage could be taken away if FC Dallas nets an away goal of their own in the Emerald City. 

Here is a look at the six key issues that will decide the second leg of this Western Conference semifinal clash.

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