Biggest world series upsets by OPS differential (with this year being 4th)

I used data from Retrosheet and Baseball Reference (the one year missing is 1903 since neither site has OPS allowed for the pennant winners). This is based on regular season OPS differential.

So this year was the 4th biggest upset.

Of course, maybe late season OPS differential could be a factor. But as I recall, there is research that says if a team is hot late in the season it does not necessarily translate into success in the post-season.

But late in the season, the Astros' advantage over the Nats only grew. In the 2nd half Houston had a .222 OPS differential while Washington had .098. In Sept/Oct, those numbers were .276 and .072.

Year	Winner	OPS DIFF	Loser	OPS DIFF	Diff
1906	CHW	0.003	CHC	0.131	-0.128
1969	NYM	0.017	BAL	0.136	-0.119
1921	NYG	0.050	NYY	0.155	-0.105
2019	WSN	0.070	HOU	0.167	-0.097
2006	STL	-0.010	DET	0.052	-0.062
1974	OAK	0.048	LAD	0.109	-0.061
1995	ATL	0.062	CLE	0.121	-0.059
2003	FLA	0.032	NYY	0.089	-0.057
1914	BSN	0.036	PHA	0.09	-0.054
2011	STL	0.049	TEX	0.102	-0.053
1931	STL	0.056	PHA	0.109	-0.053