World Team Cup

The World Team Cup was the international team championship of the Association of Tennis Professionals (ATP). The tournament was contested annually from 1978 through 2012, initially under the name Nations Cup. It was generally considered to be second most prestigious men's team competition in tennis after the Davis Cup.

Every year, the eight nations whose top two male players have achieved the highest combined placings in the men's world rankings at the end of the previous year were invited to compete for the cup.

The competition was played on clay courts in Düsseldorf, Germany. The event was generally regarded as the sports highlight of the social scene in the Düsseldorf area. It attracted around 75,000 visitors every year and was televised to over 160 countries.

From 1978 to 1981 the tournament was held under the name "Ambre Solaire Nations Cup", from 1982 until 1986 it was named "Ambre Solaire World Team Cup", from 1987-1999 "Peugeot World Team Cup" and from 2000 the event's main sponsor until 2010 was the ARAG Insurance Group, and its sponsored name was the "ARAG World Team Cup".

After ARAG discontinued sponsorship for the event and organizers failed to find a new sponsor, the 2011 edition of the tournament was cancelled. However, a new sponsor —Power Horse— was found in January 2011 and the 2011 edition took place between May 15–21 under the name "Power Horse World Team Cup".

In October 2012 it was announced that the World Team Cup event would be discontinued and replaced by an ATP 250 tournament in Düsseldorf.