The Seattle Sounders and LA Galaxy will face each other for the third time in quick succession Sunday in the first leg of the Western Conference Final. 

Sigi Schmid's Sounders earned a road draw and a win at home to clinch the Supporters' Shield at the end of the regular season. But the Galaxy did dominate Seattle in the Pacific Northwest back in July. 

Everywhere you look on the pitch Sunday at StubHub Center, you will see one of the best players in Major League Soccer at their position. The spotlight will focus on Landon Donovan, Clint Dempsey, Robbie Keane and Obafemi Martins to begin with. But as we saw with Marco Pappa in the regular season, anyone can steal the headlines. 

Here's a look at the key issues and managerial decisions that will decide the outcome of the first leg. 

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