There has been a handful of pitchers that, when they had their A Game, were truly untouchable. That's amazing, when you think about it, as the rules of baseball dictate that a pitcher pretty much has to throw 'hittable' pitches - i.e., they have to put it in the strike zone. I'm not talking about tossing a no-hitter (how many people have thrown no-nos, never to be heard from again?); I'm talking about a pitcher that every time he took the mound there was that attitude (backed up with performance) of "OK, you may get a hit, but do you really think you have a chance to beat me?" The type of pitcher that comes up in the 'if you had to pick one pitcher for one game ...' barroom debates. Here - by no other order than decade - are the pitchers I put in that category (limited to my era, pitchers I've seen):
1960s - Koufax, Gibson, Drysdale, Marichal
1970s - Ryan, Seaver
1980s - Ryan, Clemens, Valenzuela
1990s - Pedro, Maddux, Clemens, Unit
2000s - Pedro, Unit
2010s - Kershaw