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In my opinion, it's not only due to injuries and the fact that the Big 3 has been around in the same time, but also because Del Potro's movement has never been as good as it was in 2009. He became particularly less agile, unable to defend as well as he used to (he was never a great defender to begin with) and also slower. His forehand is as good as it's always been, but it's his movement that hasn't been top notch. Just compare any other year to how he played in the US Open 2009: