Well, it depends how far back you want to go. In 1875, Boston began the year 9-0 and outscored their opponents 122-21. But the game was largely different before then. If we want to go since the World Series era began, only the 1999 Indians got off to a better start, starting 8-1 and outscoring their opponents 79-35, for a +44 differential (damn it, Grimm!) If you are looking Pythagorean record, the best post-silly era pythag after the first 9 games was the 1940 Brooklyn Dodgers, who started 9-0 with 54 runs scored and 14 runs allowed, for a .937 pythagorean. The Cubs are 5th all time on that list, though: 1. 1940 Dodgers, 54 RS, 14 RA, .937 Pyth 2. 1981 Athletics, 49 RS, 13 RA, .934 Pyth 3. 2002 Giants, 46 RS, 13 RA, .926 Pyth 4. 1905 Giants, 63 RS, 20 RA, .908 Pyth 5. 2016 Cubs, 64 RS, 21 RA, .903 Pyth