Springbok captain Victor Matfield paid tribute to his side's staunch defence as the world champions withstood a late rally from Wales to win 25-29 at the Millennium Stadium.
The victory kept South Africa's hopes of a Grand Slam alive after they brushed aside Ireland last weekend.
South Africa were 17-9 behind at the break but scored 17 unanswered points in the space of seven minutes to grab the initiative from Wales.
Wales refused to cave in and mounted a fierce late rally but couldn't breach the green wall.
"I'm very proud of the boys, they showed great character," said Matfield. "Wales put us under pressure and it was a great game for the spectators to watch.
"Well done to Wales, they really came out and played well. "(Defending) is something we really worked hard on (in training) and it came through and we were happy with that," he added.
Referring to a possible Grand Slam, Matfield said: "I don't know. There's still a fair way to go. We're focusing on Scotland and that's going to be another huge game. We will enjoy tonight and then start fresh from zero on Monday again."
Meet the members of the WRU's inaugural Youth Board - after an online selection process which saw a host of high calibre candidates submit video applications the WRU has made its first 15 appointments.The board is made up of individuals aged between 16 and 21, and will meet for the first time at Principality Stadium on Monday 15th February.
The Wales Women's team headed to Dare Valley Country Park on a team bonding exercise as the entire squad got together for the very first time in preparation for this season's Six Nations championship which kicks off on Saturday with a clash against defending champions Ireland, in Donnybrook.
Wales Head Coach Warren Gatland discusses his team selection for the opening round of the RBS 6 Nations where he leads his side against Ireland, on Sunday. As WRU TV's Luke Brodley discovers, Gatland is fully aware of the challenges the defending champions pose
WRUTV caught up with Wales Women captain Rachel Taylor at the RBS 6 Nations launch and how a good crowd really helps boost the girls performance. Tickets for all three Women's home games at The Gnoll, Neath are available from www.wru.wales/tickets