St. Clair swarmed Sullivan on Friday behind five rushing touchdowns from quarterback Tim Hoffman and the Bulldogs marched to a 54-14 victory at Sullivan High School.
Sullivan fell behind early Tuesday during their home opener against St. Francis Borgia, but the team righted itself for another victory.
Sullivan hung on to a tight margin Monday at Whitfield.
Sullivan trimmed a 20-point third quarter deficit down to just seven Friday night against Festus.
Led by a hat trick from Jacob Rohrer, Sullivan posted their first conference win Thursday with a 5-1 decision over St. Clair.