The ATP Challenger Dortmund (official name: Internationaler apano Cup ) was a tennis tournament in Dortmund that only took place in 2011 as part of the ATP Challenger Tour . From 2006 to 2010 the tournament was part of the ITF Future Tour , and again from 2012 to 2013. It was played outdoors on clay. It was named after the Dortmund financial services company apano Investments , which was the main sponsor of the tournament for all editions. From 1983 to 1987 a tournament was held in Dortmund at the same location.