"We knew to come here and get a victory would be unbelievably tough and require a massive physical performance," Best told Sky Sports 1.

"We dug really deep to get that win. If we had sat back and kept giving them ball we would have eventually run out of steam, so we had to take the game to them.

"There are a lot of tired boys who are running on empty now after the euphoria of the win."

Man of the match Devin Toner echoed his captain's sentiments.

"I am really proud of everyone to be honest," he said.

"What happened after 20 minutes meant we needed to dig deep.

"We know they are an awesome, strong side so we really needed to knuckle down and we did that."

South Africa captain Adriaan Strauss admitted his team missed the opportunity to punish Ireland once they were at a numerical disadvantage.

"We had our chances. Our discipline let us down," he said.

"Every time we had the ball we lost it with unforced errors or gave away a penalty. There were easy mistakes which cost us.

"We did play good rugby at times but just when we started playing we lost the ball so that is something we need to have a look at.

"The result on the day is the most important and we are very disappointed with that."