Dortmund fans serve tennis ball protest over ticket prices
February 10 – The Bundesliga is often held up as a paragon of fairness when it comes to ticket prices. But it’s all relative and fans of Borussia Dortmund fans boycotted the first 20 minutes of their 3-1 quarter-final win over Stuttgart on Tuesday, then threw tennis balls on to the pitch, causing an unusual first-half interruption.