6. Harry Danning (1933-1942)
Wins Above Replacement: 15.5
Danning played ten seasons with the Giants. His went to four straight All-Star games from 1938-1941. His best season was 1939, where he had a slashline of .313/.359/.479 for an OPS of .838. Danning finished every season from 1937 to 1941 among the finalists for the Most Valuable Player award, finishing as high as seventh in 1940. He also played in two World Series in 1936 and 1937.
Overall, he played 890 career games at catcher in New York and had a career slashline with the Giants of .285/.330/.415 for an OPS of .745.