JUST another ordinary day in the life of one extraordinary Scottish family. While brothers and sisters throughout the land were spending their Saturdays going to the football or heading to the supermarket, the Murray clan was gathering in the Flanders Expo Centre in Ghent to watch a singular pair of Scottish siblings bring Britain to the brink of one of the most remarkable chapters in the 115-year history of the Davis Cup. Should Andy Murray overcome David Goffin in their reverse singles rubber today Britain will have their first Davis Cup title since 1936 to speak of. The only problem is that the trophy is too massive to fit on the Murray mantlepiece.

This 6-4, 4-6, 6-3, 6-2 victory for Andy and Jamie Murray against David Goffin and Steve Darcis means that products of one modest house in Dunblane have been personally responsible for 10 of the 11 points Britain have racked up to date during this glory year of 2015. James Ward was responsible for the other, against USA in their first round tie in Glasgow in March. As welcome as that point was, it essentially deprived the World No 2 of a chance to equal John McEnroe's perfect 12 points in 1982.

The day began with the news Belgian Davis Cup captain Johan van Herck had brought his star man Goffin ahead of luckless youngster Kimmer Coppejans. Depending which way you looked at it it was either a wise use of resources or a desperation move. As gifted a player as Goffin is, he doesn't have much pedigree on a doubles court. The 24-year-old had previously played just 15 previous tour level matches, losing 13 of them, and the best you could say about Darcis and Goffin as a pairing is that they were untested. This was their maiden Davis Cup outing, having previously joined forces for just seven matches, most of them in challengers, for a grand total of three wins. They hadn't competed together for two years.

For the Murrays, meanwhile, this was another milestone in their remarkable careers. The first brothers to feature in a Davis Cup final since the Bob and Mike Bryan in 2007, this was their 56th doubles match all told, and quickly became their 33rd win. They had combined three times before in Davis Cup action, winning all of them. On this form, they may be a good bet to combine for Olympic gold in Rio next summer.

Darcis, known as the Shark, shocked the world by knocking Rafa Nadal out of Wimbledon back in 2013. He also revels in Davis Cup play and there is an unorthodoxy about his play which was troubling the Scottish/British duo. It was a lob of his which put this Scottish/British pairing behind the eight ball after a tense opening as Andy Murray served at 4-4.

The Scot had told a boisterous Belgian crowd to bring it on during his singles win against Ruben Bemelmans on Friday evening and the crowd were in no mood to stay quiet when the younger Murray sibling had a break point to save. The World No 2 has a habit of finding a big first serve at the right time, though, and when an ace down the middle clinched the game the Belgians' big moment had gone.

Goffin hadn't dropped a single point on serve until then but his resistance was to crumble. Serving to Andy set point down, an efficient return and snap volley left Darcis scrabbling around in the clay and the set belonged to Britain.

Things were to get worse for the Murrays before they got better, as Jamie began to face serious pressure on both his serve and return game. Two break points had come and gone before a neat Goffin volley did the business. Darcis nervelessly served out for the set and we had a game on.

The third set was pivotal. When Belgium broke Jamie's serve for a 2-1 lead, these were crisis moments, but fortunately Leon Smith and his coaches had an adjustment to make. Andy was instructed to retreat rather than advance on the net, which allowed Britain to hang in points longer, and allowed Jamie more rein to display his prowess at the net.

"Basically when Jamie was returning, I moved to the back of the court, which I think anyway allows Jamie a little bit more freedom on the return," said Andy. "When I'm up at the net, you know, if he doesn't hit a great return, then it's a lot easier for the guy at the net to put the ball away. When I move back, it's a lot tougher for them to finish the point.

"It also allowed Jamie a little bit more time to get into the net," Andy added. "He got up to the net really quickly in the points after that. Obviously, he's extremely strong up there. We started hitting a lot more volleys at the guy who was up at the net. That was to our advantage as well, because they were very good when there was two of us at the net and they were at the back of the court using lobs and angles and stuff. It was a good change."

Suddenly Britain had a lead again at 4-2, only to get pegged back on serve at 4-3. Then it was 5-3, the fifth service break of the set engineered after a controversial point which had to be replayed when a Murray volley which landed flush on the line was mistakenly called out. The Murrays made light of the set back to get the break and Andy served out for the set.

There then followed a short musical interlude as dance music leaking in from outside the arena caused a delay, but the Murrays continued to hit all the right notes. They edged into a fourth set advantage by breaking the Darcis serve and clung onto it despite Jamie facing the ordeal of seven break back points in the very next game. When one Darcis return flew out on match point, these two extraordinary Scottish siblings briefly lost themselves in relief and jubilation. One more ordinary day for this extraordinary family will be sufficient to give them ownership of another piece of sporting history.