Juan Martin Del Potro stormed into the French Open quarter-finals with a convincing 6-4 6-4 6-4 defeat of the big-serving American John Isner on Monday.


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Del Potro, regarded as one of the biggest threats to 10-time champion Rafa Nadal at Roland Garros, broke three times and held serve throughout to set up a meeting with either Croatian third seed Marin Cilic or Italian Fabio Fognini.


"I returned very well, it was the key to the match and I broke three times, I also played well on the important points," said Del Potro, who throughout the match heard parts of the crowd chant `USA, USA!"


"I love playing here in the USA, USA!," he joked.


"We both played good tennis today. It is so special to get to the quarter-finals here, I`m having great days in Paris and I`d like to stay a few more days."