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Madrid, Spain (Sports Network) - World No. 7 star Juan Martin del Potro withdrew from next week's Madrid Open because of a viral infection.

"He has a virus and will not be fit to play," a statement on the tournament's website said. "We wish him a fast recovery."

The former U.S. Open champion from Argentina was a semifinalist in Madrid last year.

Madrid is a clay-court ATP Masters 1000 event and will feature the "Big Four" -- world No. 1 Novak Djokovic, three-time overall and reigning champion Roger Federer, Andy Murray and Rafael Nadal.

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