The Düsseldorf Open (formerly known as the Power Horse Cup) was a professional men's tennis tournament played on outdoor Clay in Düsseldorf, North Rhine-Westphalia, Germany.

The initial event took place on 18–25 May 2013.

[1][2][3] The 2014 edition of the tournament took place without a title sponsor.

[4] In 2015, the event was cancelled before the 2015 ATP World Tour, due a lack of sponsorship, and the tournament's spot in the schedule was awarded to the Geneva Open.

[5] From 2006 until 2008, the Düsseldorf Open were an ATP Challenger Tour tournament played at the TG Nord tennis courts.