No. 19 Southern California's scheduled home game Saturday against unbeaten Colorado has been canceled due to positive COVID-19 tests for the Trojans. Colorado (2-0) immediately booked a replacement game against San Diego State in Boulder on Saturday afternoon. In a statement Thursday night, the Pac-12 said USC (3-0) didn't have the minimum number of scholarship players available at a specific position group as a result of at least two positive COVID-19 cases and the resulting isolation of additional players under contact tracing protocols.