The only game in any classification between undefeated teams, a game between a defending champion and a No. 1-ranked opponent, and a rematch of longtime rivals headline this weekend's quarterfinal schedule in classes 4A, 3A and 2A. Sixty-four teams remain in the GHSA playoffs, each with an eye on the state championships Dec. 16-18 at Mercedes-Benz Stadium.

Cambridge and Cherokee Bluff made history by reaching the football quarterfinals for the first time, and Sprayberry, Jenkins County and Southeast Bulloch are back in a final eight after absences of more than 40 years. Unranked teams LaGrange, Stephens County and Aquinas victimized Sandy Creek, Callaway and Athens Academy, respectively, in the second round’s biggest upsets.

As far as upsets go, last week’s first round of the football playoffs was just a warmup for most of the state’s best teams. It’s about to get dicey Friday night, when the round of 16 arrives with 64 games on the weekend schedule, 16 that match top-10 teams.

Three games matching top-10 opponents and three rematches from the regular season headline the second-round schedule in Class A Division II and the 3A-A private playoffs this weekend. The top-10 battles are No. 2 Bowdon at No. 9 Metter in A Division II and No. 8 Lovett at No. 3 Hebron Christian and No. 9 Wesleyan at No. 10 Christian Heritage in 3A-A private.

Four games matching ranked opponents highlight the second-round schedule in Class 2A and Class A Division I this weekend. In Class 2A, No. 10 Thomson travels to No. 6 Hapeville Charter and No. 9 Carver of Atlanta visits No. 4 Appling County. The Class A Division I games include No. 10 Dodge County at No. 6 Worth County and No. 7 Commerce at top-ranked Toombs County.

A couple of Class 3A rematches from the regular season will be among the high-profile games this weekend in the second round of the GHSA playoffs. Top-seeded Jefferson will try to avenge a 32-30 loss to Oconee County in the teams’ regular-season finale on Nov. 1. Sandy Creek will seek to beat LaGrange for the second time this season after winning 27-7 on Aug. 30.