DORTMUND, GERMANY - MAY 09: Mats Hummels (R) of Dortmund reacts as referee Tobias Stieler shows Fabian Lustenberger (L) of Berlin a yellow card after he fouls Henrikh Mkhitaryan during the Bundesliga match between Borussia Dortmund and Hertha BSC at Signal Iduna Park on May 9, 2015 in Dortmund, Germany. (Photo by Boris Streubel/Getty Images)
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