Ashton Nettles scored a team-high 17 points for the Cartersville boys while teammates Gabrial Gridley, Grant Harris and Jogarious Erwin added 15, 11 and 10 points, respectively. Other scorers included Alec Hamm (2) and Kaleb Peeks (1).
The Cartersville all-stars play Dalton at 6:30 p.m. Tuesday.
The Bartow County boys also advanced to the next round, due to a forfeit.
Boys' scores
Cartersville 58, Cobb County (No. 3) 52
Rome-Floyd County (No. 1) 60, Gordon County 9
Douglas County (No. 1) 58, Whitfield County 42
Rome-Floyd County (No. 2) 62, Marietta 11
Cobb County (No. 1) 42, Douglas County (No. 2) 30
Girls' scores
Bartow County 26, Dalton 20
Whitfield County (No. 1) 42, Douglas County 10