The Cubs +131 run differential after 48 games is the best in the divisional era, ahead of the 1984 Tigers who were at +112 through 48. It's the fifth best 48-game differential in the World Series era, after the 1929 A's (152), 1939 Yankees (145), 1912 Giants (143) and 1905 Giants (141). In the wildcard era, the 1998 Yankees are the next best with a +109 differential, while they were 37-11 at this point in the season.