La Mirada High's Keanu Saleapaga is the first defensive lineman to commit to
USC is expected to sign as many as four for the defensive front in 2016.
Saleapaga, 6 feet 6 and 265 pounds, attended the Trojans' linemen camp on Saturday.
"La Mirada Football 2016 DE Keanu Saleapaga was just offered and has committed to the USC Trojans," La Mirada Coach Mike Moschetti wrote on Twitter.
Saleapaga also has offers from Arizona, Arizona State, Boise State, Oregon State and Texas Tech, according to Scout.
Nine players have committed to USC's 2016 class.
Here's a look at who has committed to USC:
Player, position, high school
Matt Fink, QB, Glendora
Velus Jones, WR, Saraland (Ala.)
Josh Imatorbhebhe, WR, Suwanee (Ga.) North Gwinnett
Melquise Stovall, RB, Lancaster Paraclete
Frank Martin, OL, Santa Ana Mater Dei
Nathan Smith, OL, Mesa
Keanu Saleapaga, DL, La Mirada
Daelin Hayes, LB, Ann Arbor (Mich.) Skyline
Mique Juarez, LB, North Torrance