Simon Cambers
Tennis journalist on BBC Sport online commentary

"While Federer is playing that far behind the baseline he won't have much luck against Wawrinka's serve. He needs to push himself forward."

Man down! Federer charges forward on the attack to meet a Wawrinka return, losing his footing on the French clay. He recovers though to nip 40-30 ahead, again going on the front foot as he looks to match Wawrinka's early aggression.

Wawrinka responds with another crunching forehand winner to take another game to deuce - then Federer decides enough is enough. The world number two turns on the old magic to blast down a serve which leaves Wawrinka all limp handed, then pulls an exquisite drop shot right out of the top drawer.

Piers Newbery
BBC Sport at Roland Garros

Image source, AFP

"Things are going so well for the home nation on Chatrier that Tsonga can afford a smile and the crowd a giggle when the Frenchman whacks a smash into the net.

"The press box is rather more full of glum faces as the large Japanese media presence tries to make sense of the hammering their man is getting.

"The usually pin-sharp Nishikori has made 20 unforced errors already on a blustery afternoon and is even getting sympathetic applause for his occasional good shot. Unheard of."

Federer edges ahead in deuce as Wawrinka misses the line with a backhand. First bit of pressure on Stan - can he hold his nerve? A booming ace answers that question. Wawrinka turns deuce on its head as Federer goes long, the pair trade winning smashes, then Wawrinka holds his nerve - and his serve - with a crashing volley. Federer looks to the heavens - he knows that is a missed chance.

Image source, AP

Chance for Federer to break back? The world number two races into a 30-0 lead after a couple of loose returns from Wawrinka. And loose is a generous description for the second - it was a shank.

Uh oh, he's blown it. Wawrinka battles back to 30-30 as Federer wafts a passing return into the cord. Or has he blown it? Federer claims a break point and has another chance. And he blows that too! Deuce...

Annabel Croft
Former British number one on Twitter

"Already the match between Federer & Wawrinka drawn gasps from crowd! Breathtaking rallies and brute force from Stan."

This is more like the Roger Federer that we know! The Swiss maestro tests the Wawrinka backhand to the max, adding in a forehand volley winner for good measure, as he serves out to love. That has settled his ticker a little bit. Game over in the blink of an eye.

Image source, AFP

Not sure what Wawrinka has eaten for his pre-match meal - but I reckon it could be a well-known, high-fibre, wheat-based cereal. He is pumped. The world number nine's serve is causing Federer all sorts of bother - the 17-time Slam winner having little response. Stan blazes into a 40-0 lead, Federer clings on to some hope as Wawrinka's backhand goes awry, before normal service is resumed.

If Federer wasn't sweating in the Roland Garros sun, then he is now. Wawrinka pummels the Federer serve with a flurry of stinging returns, teeing up three break points. And he only needs one! Federer thinks he has got Wawrinka scrambling. No sir. A wicked cross-court backhand passes Federer, hits the line and leaves Wawrinka basking in the realisation that he has taken first blood.

Relatively straightforward stuff for Wawrinka, who pounds down the serves at his fellow Swiss. Federer, his cool exterior momentarily flustered, faces three games points, saving one before a heavy return restores parity.

Cancel your plans for the evening - you do not want to miss this match. Judging by the opening game we could have a tasty one on our hands. Five points are needed to separate the pair, with a long return from Wawrinka blowing up dust past the base line. Federer clenches fist and pumps the breezy Parisian air.

Federer, wearing a dashing pair of eye-hurting pink shorts, has the honour of serving first, forcing his compatriot into a limp backhand to nick the first point.

Stan the Man roars back, going 30-15 ahead before two forehand errors - countered by a poor backhand from Federer - take the opener to deuce....

Image source, AP

The two Swiss players have finished knocking up - now it is down to serious business. A place in the French Open semi-final. Federer to serve first... Game on!

Image source, Reuters

Kei Nishikori finally sees the scoreboard ticking in his favour as he holds in the fifth game.

But that is as good as it gets. Jo-Wilfried Tsonga picks off the next two games to take the first set in just 32 minutes. The French crowd are understandably pleased.

Seven of the top eight seeds are safely into the quarter-finals, with 14th-seed Jo-Wilfried Tsonga the only intruder at the expense of Tomas Berdych.

Can the Frenchman cause a further surprise and go all the way? The home fans hope so. Realistically Rafa Nadal or Novak Djokovic are the strong favourites, while Andy Murray must fancy his chances.

But who are you sticking your money on? Tell us who you think will lift the singles' titles and - most importantly - why. Tweet using #bbctennis, or text on 81111.

Piers Newbery
BBC Sport at Roland Garros

"There might have been a few raised eyebrows as to why Federer v Wawrinka was scheduled on the second show court, with Tsonga v Nishikori taking centre stage, but that is to underestimate the desire for home success here.

"While Britain had to wait 77 years for Andy Murray to follow in the footsteps on Fred Perry, it is now 32 years since Yannick Noah took the Coupe de Mousquetaires.

"Tsonga has looked the best bet in recent years and today he hopes to become the second Frenchman in the Open era to reach multiple semi-finals, after Henri Leconte swashbuckled that far in 1986, 1988 and 1992."

Image source, AP

Ooh la la! Look at this for an early scoreline.

While we wait for Federer and Wawrinka to head out of the locker room and on to Court Suzanne Lenglen, the first men's singles' quarter-final is already under way over on Court Philippe Chatrier.

Home favourite Jo-Wilfried Tsonga - the last hope for the Parisian crowd - has already twice broken the serve of Japan's Kei Nishikori, the fifth seed,and leads 4-0 in the opening stages of the first set.

A meeting with either Federer or Wawrinka is the reward for the winner.

Image source, Getty Images

But, unfortunately for the Swiss, sport demands a winner. And it would take a brave man to bet against Roger Federer - the world number two, the 17-time Slam slayer, the man who has more silverware than stainless steel factory - reaching his eighth semi-final at Roland Garros.

Federer has sparkled in Paris - despite the gloom disrupting his fourth-round match against home favourite Gael Monfils - to look a decent punt to reach a record-extending 37th Slam semi-final.

Both men are having a final pre-match cuppa in the locker room (possibly) and will be strolling out on to court in a few moments (likely).

Image source, Getty Images

Bonjour mes amis! Welcome to day 10 of the French Open - aka the first quarter-finals day - where Switzerland is guaranteed to have one man in the last four. No wonder this horn-hat wearing Swiss bloke looks pretty smug.

But who will that man be? Roger Federer? Or Stan Wawrinka?

Based on its past neutrality, one would suspect that Swiss tennis fans only want one winner. Tennis.