Though teams will often end up with really good or bad records in one run games, that record will eventually revert very closely back to .500. The point about one run games is that the notion that good teams know how to win close games is largely false. Good teams tend to win more than their fair share of close games than bad teams do, but that record typically still hovers around .500.
That year, the Sox were 8-2 in the month of April in one run games (.800). The remainder of the year, they were 17-12 (.586).
It's important to note that the Sox record in blowout games in 2018 was 38-17 (.691).