Teams with Biggest Win % Difference when they Homer

Michael Baron of “JustMets.net” tweeted:

That results in a .467 winning percentage difference between when they DO homer (.800) and when they don’t (.333).  Is that a record?

I used the Retrosheet gamelogs to determine the won-loss records of all teams from 1911-2015 given whether or not they homered in games. Here are the top five teams in terms of winning percentage differential in a given season.

GAME WITH HR GAME WITH NO HR
year TEAM WIN LOSS PCT WIN LOSS PCT DIFF
1995 LAN 63 21 .750 15 45 .250 .500
1918 NY1 13 0 1.000 58 53 .523 .477
2009 CHN 72 35 .673 11 43 .204 .469
2005 CLE 81 34 .704 12 35 .255 .449
2004 FLO 64 26 .711 19 53 .264 .447

If the Mets continued their winning percentages in both circumstances, they’d have the fourth-highest difference all-time, behind the strike-shortened 1995 season of the Dodgers (made playoffs), the war-shortened 1918 season of the New York Giants (finished 2nd in NL) and the 2009 Cubs (finished 2nd in NL Central, missed playoffs).

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