Sandy Koufax of the 1960's comes to my mind.
Randy Johnson of the 1990's makes the list.
And Steve Carlton who was born on this day in 1944.
Over an amazing career, Carlton won 329 games with a 3.22 ERA. He also completed 254 games with 4,136 strikeouts.
His best season was 1972: 27-10, a 1.97 ERA, 30 complete games, 8 shutouts and 320 strikeouts. The amazing thing is that he pitched for a team that won 59 games.
Great pitcher. Maybe the best lefty after Koufax!