Kate Crowther:, external It has been great seeing Murray get back into his stride in past weeks, will be the cherry on the cake if he wins today!

John McEnerney:, external This should be a good test for Andy Murray to see where his game is at! Grigor Dimitrov won't fear him and has the game to have a real crack at Murray.

Image source, Getty Images

One of the line judges at Bercy has got a distinctive way of calling the lines. And when I say distinctive I mean the sort of ear-splitting shriek that Maria Sharapova would think a bit much.

She exercises her lungs as Grigor Dimitrov goes looking for a line and a way back into the game at 30-0 down, calling out at pneumatic-drill decibel levels.

Dimitrov asks Hawk-Eye for a second opinion. A lot quieter, but just as certain, it gives the same answer.

Cheeky as a saucy seaside postcard.

Grigor Dimitrov tickles a drop-volley that drops door-nail dead on Murray's side en route to a hold to love.

That was sublime, straight-to-showreel stuff.

Andy Murray's ball toss is on the wonk as he slips to 0-30.

The Scot's focus snaps back sharply though as he wins the next four points to keep his lead intact and conjure the chance out of Dimitrov's sight.

Murray is firmly in the groove, winning points on auto-pilot.

Stuie Neale:, external Come on Andy! Another dominant performance like the other day and he is at the O2.

Get involved via twitter on #bbctennis,, external Facebook, external or Google+, external

BBC Radio 5 live sports extra

Daily Mail tennis correspondent Mike Dickson on BBC Radio 5 live sports extra: "Murray is pretty happy with life at the moment and confident. It's been a fantastic effort, and I don't want to downplay his efforts over the last six weeks, but if you are winning and have a goal to aim for I don't think fatigue is such an issue. But the best news is it's probably shown him that his back is fine again."

Image source, Getty Images

Lovely acoustics at Bercy.

Grigor Dimitrov's overhead, plum off the middle of the strings, echoes around the arena like a yodel as he moves 30-15 up.

Andy Murray bosses a rally from the back to move to deuce though. Time to change it up, thinks Dimitrov. Perhaps not like that though. The fine-featured Bulgarian cuffs a forehand long under no pressure to give Murray advantage and break point.

Dimitrov's groundstrokes are straining at the leash like a pitbull and their owner is struggling to keep them under control. Another one flies long to give Murray an early advantage.

It feels like Dimitrov's strings are a little too elastic for his liking so far.

Andy Murray is looking fairly fresh for a man whose itinerary over the last six weeks has been hotel-court-plane-repeat. A mix of charcoal and jet is his wardrobe choice, accompanied with a business-like short-back-and-sides.

The first bit of close-quarters combat at the net ends with Andy Murray planting a straightforward smash wide of the tramline to give Grigor Dimitrov a sniff at 30-15.

A blockbuster of a serve down the T shuts the door though and we are even stevens.

Grigor Dimitrov opens hostilities with a comfortable hold to 15. There were a few chinks in the Bulgarian's defences but Murray's early jabs have been wide of the mark.

Russell Fuller is describing all this on BBC Radio 5 live sports extra by the way. You can tune in over the old-school wireless or your new-fangled internet cloud thingy.

Right, down to it. Grigor Dimitrov to serve.

BBC Radio 5 live sports extra

Daily Mail tennis correspondent Mike Dickson on Radio 5 live sports extra: "I think Dimitrov likes playing Murray, he matches up quite well against him. But I think it would be extraordinary if Murray didn't go through to the World Tour Finals.

"I don't quite believe Murray when he says there's no score to settle here. This is one of his big challenges and he won't want to lose three matches in a row against Dimitrov. There are a lot of points at stake - it's a big match for Murray."

Andy Murray's coach Amelie Mauresmo and girlfriend Kim Sears are both in attendance as the players knock up under the Bercy roof.

Both will be paying particular attention to the pre-match hit and giggle. Dimitrov said in the aftermath of his win over Murray at Wimbledon that he sensed that Murray was there for the taking during their warm-up rallies.

Grigor Dimitrov: "He has been playing matches and winning tournaments and perhaps that gives him an edge, but I know it is going to be a bit of a dogfight.

Image source, AFP

"I want to see where I am at at this time of year that is the most valuable thing for me at the moment."

Grigor Dimitrov still has a slim chance of making the World Tour Finals, but must reach the semi-finals of the Paris Masters and then hope the men above him in the rankings falter.

The prize today isn't as juicy as back in July.

But beating Grigor Dimitrov would mean Andy Murray tying down the World Tour Finals spot that he has been chasing around the world for the past six weeks.

He has crammed in back-to-back tournaments in Shezhen (winner), Beijing (semi-final), Shanghai (last 16), Vienna (winner) and Valencia (winner). Now, after a 6-3 6-4 win over Julien Benneteau in the last round, he faces Dimitrov knowing that victory books him in for the O2 season finale, as well as the fourth round of the Paris Masters.

Image source, Getty Images

Attempting to defend the title that he won in such thrilling style 12 months previously, Murray was roundly walloped in the Wimbledon quarter-final by Grigor Dimitrov.

Three straight sets in a minute over two hours.

It was a defeat so conclusive, so out of keeping with his form earlier in the tournament, that it sprouted conspiracy theories.

Was Murray's back still troubling him? Was all not well between him and new coach Amelia Mauresmo? Or had he had a pre-match disagreement with girlfriend Kim Sears?, external

"A somewhat whimpering surrender", external

"A miserable end", external

"Playing as if invaded by some foreign virus", external

As the critical notices suggest, Andy Murray's last performance against Grigor Dimitrov was an absolute turkey.