For the first time in Major League Soccer history, the final day of the regular season will replicate that of the Premier League and other major European leagues. 

The 10 games that will be played on October 25 will feature two blocks of simultaneous action in each conference. 

The Eastern Conference kicks off the day at 5 p.m. ET with its quintet of matches, while the Western Conference starts its action at 7 p.m. ET. 

Throughout Decision Day, we will find out who will be the top seeds in each conference and who earns the coveted Supporters' Shield. 

A few close battles for individual titles will also be decided on the final Sunday of the regular season before the MLS Cup playoffs kick off three days later. 

Here's a look at the five biggest storylines to watch on MLS Decision Day. 

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