When I lived in Phoenix, there were (and are) a lot of gyms there,and there were several guys that were looking to turn pro and were close in weight. They were having trouble getting fights so, on Saturdays after the 6 or 8 kids I had went home, they'd set up matches. There would be a few bouts and they'd go 4 rounds, fighting, not sparring, but with headgear and big gloves.