From the 1975–76 season until the 1979–80 season, the Central League was dominated by the Streetsville Derbys. In this span, the Derbys won the League title five straight times, made the Ontario finals three times, and won the Sutherland Cup once. In 1977, the Derbys made the All-Ontario final. In the final, they lost to the Stratford Cullitons of the Waterloo-Wellington Junior B Hockey League 4-games-to-2. A year later, the Derbys again met the Stratford Cullitons (now of the Mid-Western Junior B Hockey League), but lost 9-points-to-5. The 1978–79 season had the Derbys make the Sutherland Cup final for the third straight year. In the final, the Derbys met the St. Catharines Falcons of the Golden Horseshoe Junior B Hockey League and defeated them 4-games-to-none to finally win a provincial title.