Britain's men came from behind three times to beat Germany 7-6 in their third curling round-robin fixture in Sochi, while Eve Muirhead's women's rink got back to winning ways in style against the US.
On Monday, David Murdoch's all-Scottish team defeated hosts Russia 7-4 in their opener but came undone in their second match against Sweden, who triumphed 8-4.
The Germans also proved difficult opponents and surged 3-1 ahead, but Great Britain dug deep into their reserves of experience before Murdoch's side eventually clinched the game in an absorbing 10th and final end.
Germany's Felix Schulze only needed to push Murdoch's stone out of the house with his final shot, but got his line all wrong, missed his intended target and handed victory to Team GB.
It was a nervy end to the game, but Murdoch is hoping it will help his rink start to build momentum.
"We are obviously pretty pumped up after winning," stated the Scot, featuring at his third Games. "We spoke after the game and we were saying how we need to have that attitude for the rest of the games.
"We can't have a lackadaisical start. We need to come out firing a lot quicker.
"We really have to be a lot more pumped going into the first few ends and get on top of teams. It was certainly a game of two halves. We had a terrible first half.
Big win for GB women
"The coach had a good talk to us about believing in ourselves and playing the way we can and I think we did that."
Meanwhile, the women's team got back to winning ways after their loss against Sweden on Monday with a resounding 12-3 triumph over the United States inside six ends.
After a solid start they surged ahead in the fourth end as they registered seven points to assume a 9-1 lead.
The US pulled back two points in the fifth, but GB then added three more in the following end, prompting their opponents to concede defeat, their third in three games.
Team Muirhead's fourth-end tally was a new Olympic record, with it being the most points scored by either a men's or women's rink in a single end since curling, in its current format, was introduced to the Games programme in 1998.
And asked how it felt to be an Olympic record holder, Muirhead said: "You are going to take it, aren't you? I'm surprised actually a little bit that it is a record. But hey ho - we can say we are record-holders!"
"I think it was really important that we came out tonight and got that win on the board after yesterday, and it was definitely more like Team Muirhead.
"The four of us really pulled together and played well. Things aren't perfect just yet - we can still get better. But with the way we go about championships, we seem to start off slightly slow and then get better and better, so we can definitely build."