1880s: Radbourne
1890s: Young
1900s: Mathewson
1910s: Johnson
1920s: Vance
1930s: Grove
1940s: Newhouser
1950s: Spahn
1960s: Gibson
1970s: Palmer
1980s: Morris
1990s: Maddux
2000s: Halladay
Sorry, not sure I understand the tiebreaker question of "What was the average number of wins per decade that the top pitcher had?" Do you mean top
pitchers (plural)? Meaning the average wins for all top pitchers', top decade? - I'd go with 195.
The TB question as asked would mean that if the top pitcher had 210 wins in the decade they won, and 10 wins in the decade before, and 110 in the decade after, the "average number of wins per decade that the top pitcher had" would be 110.
