Every team in the MLB has a hole somewhere on their roster, and that place is oftentimes the starting rotation.
It is not easy to build a starting rotation that is solid from top to bottom throughout the entire baseball season. It is just the nature of the game that pitchers will get injured or underperform during the sometimes grueling 162-game schedule.
While some teams have better success in building a solid starting rotation than others, even good teams will have one or two starting pitchers who just can't get it done when their turn in the rotation is up.
Here is a quick look at six teams that have several solid starting pitchers slated to take the mound every fifth day, but that also have some question marks in the starting rotation.