Cubs OPS differential of .147 would be highest since 1939 if they finish with it

They have a team hitting OPS of .778 while their pitchers have allowed .631. In their last 32 games of 2015, the differential was .186 (.757 - .571). They have played 131 games this year (through Tuesday). Their differential over the last 163 games (including the last 32 from 2015), is .155, weighted by number of games played. That is almost as good as the 1939 Yankees, who have the second highest OPS differential since 1914.

Here is the top 25. Compiled from the Baseball Reference Play Index and Retrosheet

Team	Year	OPS	OPSA	DIFF
NYY	1927	0.872	0.676	0.196
NYY	1939	0.825	0.667	0.158
ATL	1998	0.795	0.656	0.139
BAL	1969	0.756	0.620	0.136
NYY	1936	0.864	0.733	0.131
STL	1944	0.745	0.615	0.130
STL	1942	0.717	0.590	0.127
CLE	1948	0.792	0.665	0.127
NYY	1998	0.825	0.699	0.126
SEA	2001	0.805	0.679	0.126
PHA	1929	0.816	0.692	0.124
NYY	1937	0.825	0.704	0.121
CLE	1995	0.839	0.718	0.121
BRO	1953	0.840	0.722	0.118
CLE	1954	0.744	0.626	0.118
NYY	1932	0.830	0.714	0.116
NYY	1931	0.840	0.726	0.114
PHA	1928	0.799	0.685	0.114
ATL	1997	0.769	0.655	0.114
STL	1943	0.725	0.611	0.114
NYY	1921	0.838	0.725	0.113
BRO	1941	0.752	0.641	0.111
LAD	1974	0.743	0.633	0.110
PHA	1931	0.789	0.680	0.109
BOS	2003	0.851	0.742	0.109