LOL I'm serious. Decent tennis fans will know that during a peak year one player still has mediocre match/matches and during a mediocre year he still can have peak match/matches.
Fred fans told me that Pete played a great match vs Fred at Wimbledon to convince me that peak Fred would beat peak Pete there, though that's the worst year in Pete's career and in the previous round it took him 5 sets to beat some random guy which I can not remember his name )))
Meanwhile, my eyetest tells me that Fred in the semi of Wimby 15 was not worse than his peak years.
So, your criteria to define a peak form match???