September 12, 1928 was the date of Carnera's first professional fight, against Leon Sebilo, in Paris. Carnera won by knockout in round two. He won his first six bouts, then lost to Franz Diener by disqualification in round one at Leipzig. Then, he won seven more bouts in a row before meeting Young Stribling. He and Stribling exchanged disqualification wins, Carnera winning the first in four rounds, and Stribling winning the rematch in round seven. In Carnera's next bout he avenged his defeat to Diener with a knockout in round six.