I'm pretty sure that if the Cubs win tonight, they will have their largest lead in 1st place since October 6, 1929. I looked up several years to make sure I was right (2001, 1989, 1984, 1977, 1969, 1945-1929) and none of them had a lead larger than 9.5 games (in 84) Biggest leads: 1906 - 20.0 GA 1907 - 18.5 GA 1929 - 14.5 GA 1910 - 13.5 GA 1918 - 11.5 GA 1984 - 9.5 GA 2008 - 9.0 GA 1969 - 9.0 GA 1973 - 8.5 GA 1977 - 8.5 GA 1932 - 8.0 GA 1945 - 7.0 GA 1989 - 6.0 GA 2001 - 6.0 GA