 In Brazil, the Copa do Brasil, the second most prestigious country-wide competition, is contested in pure "knockout" format since its inception in 1989.While the top two tiers in the Brazilian League – Série A and Série B – are contested in double round robin format, the lower tiers Série C and Série D include knockout rounds in their final stages.Bulgaria instituted an elaborate playoff system in its top flight, the First League, in the 2016–17 season.