John Peers could have his work cut out on serve. The Aussie has perhaps the weakest delivery of these four players and the French duo immediately tee off - two big returns open up 0-30, before Peers nets a volley to bring up three break points.

Can Mahut/Herbert take their chances where Murray/Peers could not? No! They see the first two break points saved, before Herbert smashes a juicy return on the third, which clears a ducking Jamie Murray and lands an inch over the baseline.

It's deja vu all over again as some crisp volleying from Murray closes out the hold from 0-40 down.

Mr H:  Best of luck Jamie Murray! Do Scotland and GB proud today and take that title!   

Murray and Peers make an electric start - two beautiful forehand returns from Jamie Murray immediately open up three break points on the Mahut serve.

The French duo save the first two, before a strong volley right onto the baseline from Mahut sees them back to the relative safety of deuce.

A big serve from Mahut and a lovely angled volley from Herbert get the French boys out of trouble.

Image source, Getty Images

Here we go...Mahut to serve first...

We're expecting the Arthur Ashe Stadium to have filled up a little since Murray and Peers were out there practising a couple of hours ago...

Tell me you haven't forgotten Nicolas Mahut? It was of course Mahut who was the gallant loser in arguably the greatest tennis match, defeated 6-4 3-6 6-7 7-6 70-68 by John Isner in an 11-hour Wimbledon epic in 2010.

33-year-old Mahut has already played in two Grand Slam doubles finals - losing both.

His partner Pierre-Hugues Herbert is more of an unknown quantity, at just 24 years old. According to his ATP profile, he speaks four languages and plays the guitar. Impressive...

Image source, Reuters

Piers Newbery
BBC Sport at Flushing Meadows

"Murray and Peers have been regulars on the Grandstand court and the cramped confines of Interview Room Three over the last week, but today they make the step up. 

"The experience of having recently played a Wimbledon final should stand them in good stead, although scheduling in New York makes it unlikely they will enjoy a similar atmosphere to Centre Court. 

"A midday Saturday start should ensure the cavernous Arthur Ashe Stadium is not exactly bursting at the seams of its 23,000-set capacity. A shame, but the prize remains a huge one."

It might have been a disappointing US Open for brother Andy, but Jamie Murray has kept the Union Jack flying - and extended mum Judy's vacation in the Big Apple.

He has romped through the men's doubles with Aussie partner John Peers, overcaming home favourites Sam Querrey and Stevie Johnson in a pulsating semi-final to set up a meeting with French pairing Nicolas Mahut and Pierre-Hugues Herbert.

It's a day for first-time Slam winners: neither of those four men have ever won a Major men's doubles title.

Image source, Getty Images

Good afternoon, and welcome to live text commentary of day 13 of the US Open.

As mentioned, we have the women's singles final coming up, but first, there's the small matter of British interest in the men's doubles final...

On a day that has already seen one unlikely older winner crowned, the US Open is guaranteed to produce another heartwarming tale for the long-in-the-tooth underdog.

33-year-old Italian Flavia Pennetta, ranked 26th in the world, meets her 32-year-old compatriot Roberta Vinci, ranked 43rd in the women's singles final.

In a few hours' time, one of them will become the first woman ever to win her first Grand Slam at over the age of 30, and complete one of the most remarkable Major victories of all.