The 2011 Power Horse World Team Cup was a tennis tournament played on outdoor clay courts. It was the 33rd edition of the World Team Cup, and was part of the 250 series of the 2011 ATP World Tour. It took place at the Rochusclub in Düsseldorf, Germany. 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 so the 2011 edition of the Cup took place between May 15–21.
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Leading the team roster, the defending champions, Argentina, also won in 2007, 2002 and 1980. They were joined by 4-time champions Sweden, Spain and United States, 3-time champions Germany (one additional title by West Germany), one time champions Serbia (also a part of the 1990 winning team Yugoslavia), 4-time runners-up Russia and newcomers Kazakhstan.
Argentina won all the matches in the Red Group reaching the final where they were joined by Germany winner of Blue Group with a 2–1 record.
Germany won the Cup with a 2–1 win against Argentina, the double match being decisive where Philipp Petzschner and Philipp Kohlschreiber defeated Juan Ignacio Chela and Máximo González 6–3, 7–6(7–5).