ATP Düsseldorf Open

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 event was affiliated with the ATP 250 series, on the ATP Tour. The initial event took place on 18–25 May 2013. The 2014 edition of the tournament took place without a title sponsor.

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.

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