On August 21, 1933, Yarosz won the Pennsylvania version of the world middleweight title from Vince Dundee in ten rounds before 15,000 at Pittsburgh's Forbes Field. Yarosz annoyed Dundee with frequent left jabs to the face and scored repeatedly with rights to the jaw. In the second, Yarosz had Dundee against the ropes for over a half minute, and scored with lefts and rights to both the head and face with little return. In the ninth, Dundee took a strong offensive stand, but was too exhausted to do much damage to Yarosz.