If we are speaking about the best level reached ever for only ONE match, then why to restrain to all time great? They are all time great because they could sustain a very high level, but it is very possible that the highest level ever reached might have been reached by someone else, far less consistent than them. I can't say for the older player, but Safin or Nalbandian are said to have a very high peak level (which they never sustained). Even Rosol could be eligible!
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