FRISCO, TX - MARCH 06:  Maximiliano Urruti #37 of FC Dallas celebrates his goal with Mauro Diaz #10 against the Philadelphia Union in the second half during the MLS opening game at Toyota Stadium on March 6, 2016 in Frisco, Texas.  (Photo by Ronald Martinez/Getty Images)

4 Must-Watch Games in MLS Week 21

The MLS All-Star Game is now a thing of the past, so teams in MLS will shift the focus towards Week 21 of the campaign. There will be some decisive games in the playoff race, a trend that will likely be repeated until the end of the regular season.

Here are four must-watch games this weekend. You are not going to want to miss these games!

4. Philadelphia Union vs Real Salt Lake

The Philadelphia Union is not the best team in the Eastern Conference anymore, but they're only three points behind the top spot in the standings. They need to win if they want to keep themselves near the top, but they'll face a tough challenge against Real Salt Lake. RSL is a team that's talented enough to compete with the best of them in the league.

3. FC Dallas vs Vancouver Whitecaps

FC Dallas remains at the top of the Western Conference standings, but they'll have a tough challenge facing the Vancouver Whitecaps this weekend. Two of the best offenses in the West will collide, but it will also be an interesting game between two of the best Latin playmakers in the league: Mauro Diaz in Dallas and Pedro Morales in Vancouver.

2. New York City FC vs Colorado Rapids

​In a game that could have plenty of consequences for the top spot on both Conferences, New York City FC will try to stay at the top of the East when they host the Colorado Rapids at Yankee Stadium. David Villa, Frank Lampard and the rest of NYCFC have been very good in recent weeks, but they'll face a Colorado team hasn't lost since April 9.

1. Seattle Sounders vs Los Angeles Galaxy

The biggest game of the week will be the one between the Seattle Sounders and Los Angeles Galaxy. LA continues to fight near the top of the Western Conference, but Seattle will be a tough opponent in what will be their first match without long-time manager Sigi Schmid. ​Will Seattle start their recovery, or will the Galaxy dominate the game with ease?