South Africa's backs Makazole Mapimpi and Lukhanyo Am scored second half tries, as the Springboks beat the British & Irish Lions 27-9 to win Sunday's (NZ time) second test at the Cape Town Stadium and level the series.
Handre Pollard added five penalties and a conversion for a 17-point contribution, while the Lions points all came off the boot of Dan Biggar in a niggly and ill-tempered contest that, again, was one for the purists rather than the enthusiasts.
The result sets up a decider next Sunday, after the Lions had won an attritional first test 22-17.
The Lions were 9-6 up at halftime but the Springboks bounced back with a dominant second half performance that turned the tide of the game.
The Boks scored 21 unanswered points in the second period, a reversal from the first test when it was the Lions who roared to the win with forward dominance after halftime.
"That was special, it was what we needed," Springboks captain Siya Kolisi said. "It has been a tough week, for me personally as a leader it has been the toughest week I have had to face.
"But I'm thankful for the coaches, who made us focus on the mistakes we made in the first test. Our maul and scrum was much better this week.
"I'm grateful we stood up to the challenge, that is how I know us as a team."
The Lions' Kiwi coach Warren Gatland rued his side's inability to build on its first half display.
"Going into halftime, we felt that we carried well, got some forward momentum but just didn't achieve that at all in the second half," said Warren Gatland.
"We didn't have any momentum, no real opportunity to play, nothing at all from any kick returns. whether it was us or them and that was disappointing.
"We've given away some penalties. In fairness to them, they've scrummaged pretty well in the second half, drove a lot and got some reward from that. The players are obviously very disappointed."
The Lions were clearly fired up from the start, led by captain Alun Wyn Jones, as they piled into tackles and beat the Boks back, but it was the home side who took the lead from an early penalty.
Biggar slotted two penalties to put the Lions in front before both sides were then reduced to 14 players within a few minutes of each other.
First Van der Merwe received a yellow card for a cynical kick at the shins of Bok wing Cheslin Kolbe, before the latter was also sent to the sin-bin when he upended Lions scrumhalf Conor Murray in the air.
It was a contentious moment in which he might have been given a red card, saved perhaps by the fact he had his eyes on the ball all the way and there was a lack of malicious intent.
South Africa levelled through a Pollard penalty just past the half-hour mark, but Biggar added to his tally and the Lions led 9-6 at the break.
The Boks struck first in the second period when they swarmed into the Lions 22, and Pollard's cross-kick was collected by Mapimpi on the right wing and he was able to score the first try of the game.
Both teams emptied their benches onto the pitch just before the hour mark, and it was the Boks who came out the stronger.
They drove a maul a full 25 metres into the Lions' 22, scrumhalf Faf de Klerk's clever grubber kick was pounced on by just before it went over the dead-ball line and the home side led by nine points.
They continued to force the Lions into errors at the breakdown and set piece, and Pollard extended the lead with his boot.