What a brutal run since the half-way mark for many of my teams. These teams were all on a pace to advance thru 81 games. Three* of these teams still have positive run differentials despite being a combined 35 games under .500.
1918 Cubs, 53-68 (started 42-39, 11-29 since)
1930 Robins, 58-63 (started 41-40, 17-23 since)
1956 Yankees*, 51-70 (started 38-43, 13-27 since)
1961 Yankees*, 57-64 (started 41-40, 16-24 since)
1964 White Sox*, 56-65 (started 40-41, 16-24 since)
1978 Yankees, 54-67 (started 43-39, 12-28 since)
2006 Twins 59-62 (started 42-39, 17-23 since)
In total, 287-280 (.506) thru 81 games, 102-178 since (.364).