After slipping to 9 - 10 in 1954 , he won 15 games again in 1956 ( while leading the major leagues with a 1.97 ERA ) .
Was a 20 - game winner for the White Sox in 1956 and in 1957 .
After slipping to 9 - 10 in 1954 , he won 15 games again in 1956 ( while leading the major leagues with a 1.97 ERA ) and was a 20 - game winner for the White Sox in 1956 and in 1957 .