5 postseason dark horses -- if they make the field

- MLB: 298 events in the last 90 days
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What happened
Rarely has a Major League Baseball season been more forgiving to middling ballclubs. Consider that 18 teams have at least double-digit playoff percentages entering play Thursday, according to FanGraphs' projections. That's 60% of the league that is still very much at least alive for the postseason.
Summary assembled by rule from the sources below