Rouzbahani had previously defeated Bauderlique last December, but was shocked by the energy and power from the challenger in their rematch.
After an opening round of blistering action which saw both men attack with fierce intensity, the momentum of the bout swung dramatically in the second frame.
The brave Iranian returned to his feet before the count had been completed, and managed to survive the round despite a continued onslaught from the Frenchman.
Just as Bauderlique was getting comfortable, the tide turned again in the third frame when he too was knocked down following a big right hand from the resilient Rouzbahani.
Each man continued to force the pressure in the middle stages of the bout, where the defending Champion consistently snapped hard shots to the body, while the aspiring title holder continued to threaten with his lethal left hand.
Bauderlique’s previous three opponents had all failed to hear the final bell in APB, and that record advanced to four following the eighth round in Moscow, when yet another left hook heavily dropped his bloodied rival.
Just as he had before, the valiant Rouzbahani rose off the canvas, but was in no position to continue, and the referee stopped the bout 71 seconds into the eighth round.
It was a much needed knock out, as just one point separated the two fighters on all three scorecards, and the two warriors both shared their respect after the phenomenal bout had finished.
Finally, a delighted Bauderlique received his belt and officially became the second French Champion in APB history.