He's a difficult player to assess. For one, he has a top-heavy resume, with three Slam titles but only one Masters and a couple ATP 500s, and no year-end finishes above #4. On the other hand, when he's on his game he's more dangerous than anyone on tour except The Big Three, and only when those guys are playing their best.
As far as his historical placement goes, I still see him behind Jim Courier, Arthur Ashe, Guillermo Vilas, Ilie Nastase and Andy Murray. He seems to be more in the group with Stan Smith, Gustavo Kuerten, Lleyton Hewitt, Andy Roddick, and Marat Safin, but with a distinctly unique resume. Another Slam title or a couple more Masters probably puts him up in that first "lesser greats" group.
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