What happened: Christian Pulisic has been ruled out of the United States' World Cup group-stage match against Australia with a calf injury. Manager Mauricio Pochettino will hand Ricardo Pepi the start in his place. The decision removes the Americans' most influential attacker from the lineup for the Group D fixture.

Why it matters: Pulisic is the same Christian Pulisic who led the USMNT past Senegal in their final tuneup, and his absence reshapes the American attack at a pivotal moment. With the U.S. looking to strengthen their position in Group D, the burden shifts to Pepi to provide a focal point up front. How the side compensates for Pulisic's creativity will shape their group-stage outlook.

What to watch: Watch how Pepi performs in an expanded role and how quickly Pulisic's calf allows him to return for the United States' remaining group fixtures.