Andy Murray with a whipped forehand across court...and it is a winner!

A speedbump in Wawrinka's path when the Swiss had been coasting at 30-15.

Double-fault! Break point Murray!

Image source, AFP

"C'mon!" 

The shout of delight is in English, but its owner is Swiss.

Stan Wawrinka celebrates as Andy Murray punches long on the second of two break points.

Andy Murray needs an immediate response.

Andy Murray backed into a horrible corner at 0-40.

Three break points to defend. And if he fails, Stan will serve for the opening set.

Service game flashing past with the speed of scenery on the Tokyo-Kyoto express train.

Stan's turn to pummel down the fuzz. The Swiss knocks off another game, for just one point's worth of damage. 

Image source, Getty Images

I had forgotten that it is the time of year that fragrance adverts come out to play. 

Andy Murray rattles through his service game in less time than a multi-million pound perfume-flogging pout-fest.

Hold to love to show Wawrinka that whatever he can do...

Maybe the momentum is sliding Stan's way...

Wawrinka waltzes through a service game for the first time without a fuss.

A hold to love to keep the pressure on Murray after the Scot had to save break points in his last service game.

Jamie Delgado
Former Great Britain Davis Cup player

At the end of the day we want Andy to focus as best he can and play his best tennis. Maybe he is trying to keep his mind on the tennis.

Piers Newbery
BBC Sport at the O2 Arena in London

It's interesting to see an empty row of seats where Team Murray should be sitting - I'm sure they will be along soon, but he did discuss the very topic in his latest BBC Sport column.

"I have played tournaments before when I've only had one person with me and I don't mind it too much, but at tough moments especially it can be a bit of a comfort blanket to look over at people you know when you're in front of a huge audience."

Image source, Reuters

Andy Murray comes through his first serious bit of service sweat.

This match is a tight and tricky to call as we expected.

Max Baggins-Craig, external: Andy's fab, but Wawrinka's equally as good, yesterday was great, get readu for another belter :)

Sophie Weguelin, external: Excited to watch @andy_murray, external in the @ATPWorldTour, external@bbctennis, external#comeonandy, external#bbctennis, external

Let's have your chat via #bbctennis, external on Twitter or on the BBC Sport Facebook, external page.

Andy Murray with the ugly end of 0-30 to look at and the first real test on his serve.

He grinds his way back to 30-30, but a mid-court invite is snapped up by Stan Wawrinka as he steps in a slap a forehand winner across court.

30-40 and break point Wawrinka.

Murray sends down a spicy serve and Wawrinka cannot scrape it back. Deuce.

Andy Murray with one of his trademark chases and scraping winners out wide brings the crowd out of their seats and brings up the first break point on the scoreboard.

Stan Wawrinka redeems it with an ace which catches a sliver of whitewash. 

Second break point. And again, Wawrinka's bazooka serve blasts him out of a hole.

The Swiss survives this time. But Murray is asking all the questions.

Image source, Reuters

Can the umpires send the backroom entourages to the stands like in football?

Kim Sears and the rest of Team Murray are located way up in the gods rather than in their usual courtside seats.

Maybe there is something up there. Murray was a little tardy getting out of his dressing room after getting the call from the tournament organisers.

Their man has started well however. Wawrinka is taken to deuce for a second successive game.

This is high-quality vintage straight from the first sip.

Andy Murray with some streetwise hustle as he successfully serves and volleys on the opening point.

Stan Wawrinka's forehand is already launching volleys of fire, proving too hot for Murray to handle on the next point.

Murray holds him at bay though. He landed three out of five first serves in that opening game, stat fans.

Image source, Reuters

Well, that did not last long.

Big Stan ejects Murray from deuce with the efficiency of a nightclub bouncer, splattering a forehand winner before crashing down a resounding ace.

Stan Wawrinka can lurk deep behind the baseline and is not the slickest mover in the men's elite.

Andy Murray breaks out the drop-shot in just the second rally to try and exploit that fact.

Stan is lured in and Murray is only just off target with a lob that the Swiss was not getting anywhere near. That tactic will be worth revisiting.

A terrific return winner for 30-40 from Murray and then Wawrinka dumps into the net on the next rally.

Time to get deuce-y.

Right, enough of the lights and lasers.

Time for the cat gut and graphite to do the talking.

The two players set forth from their stools to the baseline.

Stan Wawrinka to tee us off...

It looks likea remake of Tron out there., external

Is Murray's mind elsewhere? Can Wawrinka capitalise? Who do you fancy to win the title?

Murray is an odds-on shot with the bookmakers for tonight's match at about 8-13, while his opponent is 13-8.

Let us know your thoughts throughout the match, using #bbctennis., external

Image source, EPA

Sometimes Andy Murray looks like he would rather be anywhere other than a tennis court.

But the Scot says that he has never lost the sheer joy of whacking a tennis ball across the net.

"I'm not denying that there are moments out on court when I might be gasping for breath, after four or five extremely physical rallies, and think, 'I need to try and shorten this point'," he writes in his latest BBC Sport column.

"But actually waking up and not wanting to hit tennis balls? No, I enjoy it too much."  

He doesn't say the same for the post-match media conferences funnily enough.