It isn’t the Fourth of July yet, but get ready for some fireworks in MLS Week 18. Of course, we’re speaking in literal terms for the Ultras in San Jose.

The quarterfinal of the U.S. Open Cup highlighted the mid-week action in MLS. The Chicago Fire, Portland Timbers, DC United and Real Salt Lake all advanced to the semifinal with impressive victories.

The rest of the league will look to join the momentous festivities this weekend. A total of eight matches are scheduled.

But with so much action on tap, what warrants your attention in Week 18?

Read on to find out.

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