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john/z28jdThe ERA record is actually 0.96 by Dutch Leonard in 1914,and he pitched over 220 innings that year so its not cheap by any stretch.If you look at baseball-reference they have Tim Keefe at the lowest 0.87 i believe in 1880 but its in just over 100 innings.Mordecai Brown is also ahead of Gibson when he went 26-6 1.04 in 1906
Most unbreakable record has to be John Coleman who owns 4 unbreakable records.He was a good outfielder for Pittsburgh(appears in the old judge set) so its a little surprising that he holds these records.
Most losses in a season 48
Most hits allowed 772
Most runs allowed 510
most earned runs allowed 291
Talk about taking one for the team,he did it for a whole season!