Major League Soccer returns for Matchday 21 with a packed schedule highlighted by high-stakes rivalry clashes and the highly anticipated debut of Chilean forward Alexis Sanchez.

With the playoff race intensifying across both the Eastern and Western Conferences, Matchday 21 features several marquee showdowns. The spotlight will firmly be on Sanchez as the former Arsenal, Barcelona, and Inter Milan star prepares to make his first appearance, adding world-class quality and international pedigree to the league.

Alongside individual debuts, classic rivalry encounters take center stage as teams battle for crucial regular-season points and local bragging rights heading into the second half of the campaign.