A Dortmund player picks up a tennis ball fans through on the field at the DFB Cup soccer match..., Stock Photo, Picture And Rights Managed Image. Pic. PAH-65729753 | agefotostock
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Borussia Dortmund fans hurl tennis balls onto pitch in ticket price protest (VIDEO) — RT Sport News
Borussia Dortmund fans interrupt cup tie by throwing tennis balls onto the pitch - Independent.ie