There was some exchange at the end of the game thread yesterday about whether the Cubs have a more difficult remaining schedule than the Brewers.
I got some pushback on my opinion that the Cubs schedule isn't any harder than the Brewers schedule and I'm going to elaborate on that opinion here. One response I got declared that the Cubs' schedule is harder because their opponents have an aggregate winning percentage of .506 vs .485 for the Brewers' opponents.
I think these numbers support my point more than refute it. The Brewers and Cubs both have 10 series and 32 games remaining. In 32 games a team with a winning percentage of .506 would expect to pick up 16.192 wins, while a team with a .485 winning percentage would have 15.52 wins. So, by this measure alone, the Brewers schedule "advantage" would be about a half a game.
To illustrate how insignificant this difference is, the Brewers current winning percentage is .562 and the Cubs percentage is .531. That difference of .031 percentage points is slightly higher than the .021 points difference between the Cubs and Brewers opponents. Would you really argue objectively that a team that had to play the Cubs this week has an "easier" schedule than one playing the Brewers because of that difference in winning percentage?
The other problem with using season to date winning percentages to project future schedule difficulty is that the teams that play in September may be different or peforming significantly better or worse than the teams that played the first 5 months.
It has already been mentioned that the Braves might not be as imposing the last week of the season (when the Cubs play them) as they have been for most of the season. They might be resting players, shortening outings for their pitchers, or playing with less motivation than they did before they locked up one of the playoff byes.
As for teams currently fighting for wild card spots, they might have dropped out of contention before the Cubs or Brewers play them. And those teams have not necessarily been more difficult to beat than ones who are out of contention. To illustrate this, just look at the records of NL teams since the All Star break. In the 40 or so games each team has played since the break, 5 of the 6 best records belong to the Dodgers, Cubs, Brewers, Braves, and Phillies, not coincidentally the top 5 teams in the playoff race. The outlier with a record of 25-16 (virtually the same as the Brewers 24-15) is the Nationals, who would be considered a relatively easy opponent based on their overall record.
All other NL teams have records under .500 since the break, including the Mets (18-23), Cardinals (18-23), Padres (18-23), and Pirates (17-24), whose records are very similar to, if not better than, the playoff contenders. The post break records of those contenders: Giants (18-22), Reds (18-23), DBacks (17-23), Marlins (13-26).
When you put all of this uncertainty together, I conclude that the Brewers schedule advantage over the Cubs falls somewhere between nonexistent and insignificant. Their real advantage comes entirely from the 4 game lead they currently hold, plus the one game edge in the season series against the Cubs.
This highlights all the more how pivotal the current series is. The Cubs can significantly improve their position just by winning 2 out of 3, much less winning all 3.
BTW, Fangraphs projects the Brewers to go 17-15 in their last 32 games, and the Cubs to go 16-16. This suggests that the projections do not detect a significant schedule advantage for the Brewers.