Smith was pleased with a great win over Bulgaria

"We're obviously very pleased with the result," he told BBC Sport after the 5-1 win in Japan. "With all the travel we thought we'd have some trouble.

"He's (Boyd) been scoring a lot of goals in domestic football and deserved a chance at this level.

"We're a team that has had trouble scoring in the past so hopefully he can help us score some goals."

Boyd's Ibrox team-mate Chris Burke came off the bench to also score twice on his international debut, while James McFadden added the other goal for a side missing a host of extablished players.

"I'm thoroughly delighted," Burke told BBC Sport. "I was just happy to get on and my second touch was a goal.

"I don�t score that many goals but now I've got more goals than caps!"

Scotland last scored five goals in a home win against San Marino in 1995, while they last matched that feat on foreign soil when New Zealand were beaten at the 1982 World Cup.