Zareen won the bout after local favourite and former champion Sevda Asenova abandoned the contest during the opening round.
In other matches, VfL Wolfsburg edged past Hertha Berlin 2-0; promoted Ingolstadt snatched a last-gasp 1-0 win at Werder Bremen
Brazilian soccer legend Pele is doing 'fine' and will be discharged from a Sao Paulo hospital early on Thursday after he was admitted for stomach pains, one of his aides said.