Looking at the past 5 years, these teams are Mr. Hyde post all star break (means they were much better):
Astros 26.35
Indians 23.66
Phillies 17.60
Nationals 12.08
Yankees 10.03
These teams were Dr. Jekyll post all star break:
Rangers -7.05
Twins -10.09
Orioles -11.80
White Sox -12.57
Brewers -16.72
Tigers -34.29
I didn't use W/L for this. I used $For / $Against if you had bet on them. Because the number of games are different pre and post ASB, I used a simple $ W/L per game and compared them post and pre ASB. The number shown here is the difference in $W/L per game post ASB - $W/L per game pre ASB.
There could be a couple of reasons for these results. Obviously a team could just win or lose at a much greater clip. Or, the lines makers could overestimate/underestimate the team and the lines are off so the lines don't reflect the W/L potential of the team.
Astros 26.35
Indians 23.66
Phillies 17.60
Nationals 12.08
Yankees 10.03
These teams were Dr. Jekyll post all star break:
Rangers -7.05
Twins -10.09
Orioles -11.80
White Sox -12.57
Brewers -16.72
Tigers -34.29
I didn't use W/L for this. I used $For / $Against if you had bet on them. Because the number of games are different pre and post ASB, I used a simple $ W/L per game and compared them post and pre ASB. The number shown here is the difference in $W/L per game post ASB - $W/L per game pre ASB.
There could be a couple of reasons for these results. Obviously a team could just win or lose at a much greater clip. Or, the lines makers could overestimate/underestimate the team and the lines are off so the lines don't reflect the W/L potential of the team.