I'll say it: Mac Best Ever (on a given day) The more I think about it, the more I can live with the notion that John McEnroe is arguably the best player ever in a restricted given match setting. I'm not talking about consistently - I'm talking about playing the game as well as it can be played in a given match. For that, I'll take the 1984 Mac against anybody. Sampras and Federer are consistently brilliant, so that it's hard to make out the peaks in their play. 1984 Mac is the guy I'd pick to play any single match that needed to be won. I might feel differently with a little more distance from Fed's current run, which will end someday, but Fed's Nadal Achilles heel and Mac's tremendous passion and intimidation tip the scales in his favor by a small margin. Think about it, 1984 Mac on a neutral surface really competing against ice king Fed, not sitting back on the baseline and letting Fed slowly dictate but hitting the deep approach, blanketing the net and serving lights out. 1984 Mac could beat this guy, no question, a majority of the time.