8. Roger Federer
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I expect to take some heat for this selection, but at least hear me out first. Let me be clear, Federer makes it onto the list purely based on his astonishing ability to neutralize monstrous first serves during his peak.
His ability to absorb the pace of the serve and knock it back to a good length was unmatched from 2004 until 2006. Statistically, the Swiss was the best fast-court first serve returner between those years.
The newly crowned World No. 1 may have crept up even higher on the list if not for his puzzlingly passive second serve return. Federer almost exclusively chips back even the slowest second serves, generally content to begin the point in a neutral position.