As the Chicago Cubs get closer to clinching the NL Central division, they are definitely going to want to rest some of their starters down the stretch to keep them fresh for the playoffs. This includes the starting rotation, which has the lowest ERA in baseball.
With the Cubs rotation poised to pitch over 1,000 innings this year, a little rest in September will go a long way to keeping them fresh for the playoffs.
When the second half of the season began, the Cubs mentioned that they wanted a sixth starter, who can make some spot starts and lighten the load on the rest of the rotation.