Top 5 in my opinion for a single game in their prime: Walter Johnson, Pedro Martinez, Lefty Grove, Randy Johnson, and Greg Maddux. All were lights out at the height of their powers.
Best single season ERA+ for each:
259 Walter (second best for a season was 240)
291 Pedro (second best for a season was 243)
217 Lefty (second best for a season was 189)
195 Randy (second best for a season was 193)
271 Greg (second best for a season was 260)
ERA+ gets me down to Walter, Pedro, and Greg. Facing ATG lineups would be beyond brutal. You'd need to somehow be able to go deep into the game, and an increased strikeout rate would also help against ATG lineups to get out of trouble. A tough call between the three, but I'd go with Walter since he has a better chance at pitching deep into the game while also getting some strikeouts to get out of trouble.
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