Now that Major League Soccer and the players' union have agreed in principle to a new collective bargaining agreement, it is time to fully focus on the 2015 season.

The 20th installment of MLS will feature two new clubs, Orlando City and New York City FC, as well as a new conference structure to accommodate the additions to the Eastern Conference. 

While there are plenty of storylines worth following throughout the next nine months, we opted to select five key ones that fans should have their eyes on.

Here's a look at the five key storylines to follow in the 2015 MLS season. 

Begin Slideshow

Source: Click Here