The Chicago Cubs are one of many teams that will try to bolster their starting rotation for the postseason. The Cubs have had solid starting pitching all season, but it could never hurt to add more. Thankfully, there are solid starting arms on the market who could not only help Chicago for the rest of 2025 but for the remainder of what it believes is the team’s competitive window. Bleacher Report’s Joel Reuter released his list of the “Top 25 Non-Rental Targets at 2025 MLB Trade Deadline” on Wednesday morning, and Pittsburgh Pirates starter Mitch Keller was at the top of the list.