It's difficult to find a lot of early season classics but the the USC-Cal game from 2003 make the list.
This game turned out to be a roller coaster ride featuring beginning of a USC roster that would dominate the sport for the next three years and a JUCO transfer named Aaron Rodgers making his 2nd career start at Cal.
USC and Pete Carrol came in ranked 3rd nationally and the Bears were looking for their first win over a top 5 team in more than 50 years.