The Doncaster bantamweight received a 114-113 verdict from all three judges after battling back from a third round knockdown in Texas.
McDonnell has been considering a move up to super-bantamweight, which would pave the way for big domestic clashes against Scott Quigg and Carl Frampton. ??
But before that he says he will likely head back to the United States for a second fight with Kameda and intends to win the return bout in convincing fashion.
???I was going to beat Kameda and move up, but he wants the rematch,??? McDonnell told Ringside.
???They have already spoken to us, they want it out in the States again and I think we will probably go with a rematch.
???I believe it???s an easy fight and I believe I will stop him next time. People won???t believe what I???m saying, but I will go out and stop him and then will probably move up.???
His ambitious plans appeared to be in peril when he was dumped on the canvas by a big right hand from Kameda, but the two-time world champion insists he quickly regained command.
???I thought my career was on the line, I was not going to get beat,??? said McDonnell. ???The shot didn???t hurt me and I can remember sitting on the floor thinking: ???How have I got here???? I bounced up and dug in.
???The fight was an easy fight. I???ll say that to anyone. I strolled through the fight, fitness wasn???t an issue. I felt tremendous in there.
???This was the first fight I have looked forward to getting in there and fighting.???
In the closing minutes, McDonnell staged a determined assault and appeared to put the finishing touches to a famous victory on American soil.
But McDonnell faced a nervous wait before learning that he had retained his title and ruined the unbeaten record of the US-based fighter.
???At the end of the fight, I thought I had done enough, but getting the decision out there is hard,” he said.
???I didn???t think I would get the nod, but I did and it was a great experience. I totally believed I would beat him.????? ??????