The Indian authorities, however, did not lodge a protest against the verdict.
Stalker, on the other hand, said he was happy with the result but felt he did not box as well as he could.
"All I wanted to do was fight. In my next bout I know I will do better. I felt sluggish after the first round. Being in my hotel for the last week hasn't done me any good," Stalker said.
"I just wanted to get the first fight out of the way. The fans got me through it. Being an Olympian is special. It was a tough fight and I felt I didn't really box too well but a win is a win," he said.
"I felt like I needed to move my feet a bit more. The last round was not good. I think I went a bit more negative in the last round when I could have been more positive."
On his opponent questioning the judges' decision, he said, "I have had fights when I thought I had won by more than I eventually won by. I just leave it to the judges. I would like to thank everyone who supported me."
The Indians have been at the wrong side of judges at the ongoing Games, losing a protest filed against Sumit Sangwan's (81kg) first-round exit.
Later, Vikas Krishan (69kg) was ousted despite being declared a winner initially after his American opponent won an appeal against his triumph.
PTI