It looked roughly the size of a basketball court. Not to be a sourpuss, but I can't help feeling that played a lot more to Galaxy's advantage (in his hometown) than Moon's. The crowd sounding like they were about to stampede every time he feinted didn't hurt, either. Put 'em back in a regular ring and Moon roughs him up again.
They are both very small let's not forget. Moon's trainer had just died. And Khaokor didn't take long to warm up. Also, in their first fight it was scrappy. Moon didn't impose himself at all compared to what we're used to. He moved down to super fly. He knew.