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          Keys for cup final underdogs: Aston Villa, Wolfsburg and Athletic Bilbao

          Photo by Michael Regan - The FA/The FA via Getty Images
          • Adrian Melville, ESPN Insider
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            • Joined ESPN in 2013 as a soccer Insider
            • Worked previously at NBC, Major League Soccer and Opta (UK)
            • Played college soccer at Princeton and professionally for the New England Revolution and Santo Andre, a second-division club in Brazil
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          May 29, 2015, 03:45 PM ET

          The best part about national cup competitions is that they are set up so that any team can win. Often there are underdogs that come through and surprise Europe's elite clubs, and the results often emphasize how little there is to separate teams at the highest level of competition.