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The shot with which Juan Marin del Potro gets the bigger edge against the rivals is the Serve. He makes on average more aces/service winners & less double faults. The Serve could have been placed before the Punch in his case.

Juan Martin del Potro's main weapon from the back of the court is the Punching Forehand. However, his forehand is a mix of Punch, Retrieve & Tempo. Punch because he constantly puts pressure to his rivals, Retrieve because he gets an edge against the rivals by making less errors than them on that side and Tempo because the forehand is also played with pace close to the baseline.

Juan Martin del Potro is a Puncher who plays close to the baseline in Tempo. Like this Punch & Tempo work together. Another area where he is a good Tempo player is the backhand that he plays almost flat.

Winning only 8% of his points at the net, Juan Marin del Potro can't be regarded as an Offensive player at all. However, when he comes in he wins 73% of the points which is above the average of the ATP players. It means that he mainly moves forward to finish a points dominated from the back of the court.

Juan Martin del Potro's use of the court geometry is just perfect. To sum it up briefly, 2/3 of the time he plays cross putting pressure & 1/3 of the time he goes down the line (without taking extra risks) to change the game pattern. As a consequence, when compared with the rivals, he dominates them from the back of the court by making 30% less errors with the forehand & backhand. His game plan allows him to make less errors than average himself and constantly put pressure on his rivals. In that regard, he is also a Retriever.