The Chicago Cubs have to make an addition to the starting rotation at the trade deadline and depending on how desperate Jed Hoyer feels it could be a blockbuster move. Although there aren't several aces to choose from the Cubs have plenty of options in the trade market to address their need either at the top of their rotation or at the back-end of the starting rotation.

The A's could also look to buy, by making players who don't have clear roles with the team available as they return from the All-Star break. The A's would unlikely dip too much into their farm system,

The Chicago Cubs have let the Milwaukee Brewers claw back into the National League Central race. The Cubs' starting rotation could use some upgrades if they want to ensure a division title.