Bernard Clayton: Surely this has to have been one of the worst tournaments ever. Only one match has gone to three sets and a ridiculous number of matches over in less than an hour. But why? This will not encourage people to apply for tickets next year.

Al, Cambridge: The gulf between the top three and the rest is big right now. And it's been a weird week. By today, 10 of 21 sets were 6-1 or worse. Unusual for men's game.

Tom Carr:, external I always thought Murray was leaning towards McEnroe when he was looking for a new coach, but he should see how Aus Open goes.

Applause from the crowd as Djokovic comes out on top of a baseline rally thanks to a bullet of a forehand down the line. The world number one collecting points with ease, though Berdych levels from 15-30 to 30-30 thanks to a punchy serve. An overcooked Berdych backhand... groans from the crowd... and they start to slow clap as Berdych attempts to regain composure to save a break point.

The pair battle it out from the baseline, going from side to side, and, surprisingly, it's Djokovic who crumbles like a chocolate flake. On the next point, the Serb is pushed out wide by some big hitting from Berdych and even the game's greatest retriever has to occasionally wave the wide flag. Berdych at advantage, then deuce, then advantage, before finally holding as Djokovic nets.

Andrew Castle
BBC tennis commentator on BBC Two

"Berdych needs to get the scoreboard rolling in this second set - and break the hour mark for this match."

Dino Vlachopoulos:, external This week you almost get the impression players other than Federer and Djokovic are amateurs.

SportsFan:, external Must be great to play tennis with the feeling that you are not going to miss. Mortals can dream!

Image source, AP

A serve out wide, Berdych goes the wrong way, Djokovic follows up with a textbook volley. Simple but effective by the Serb. "Come on," Djokovic whispers to himself as he bamboozles Berdych with an ace and, without fuss or drama, Djokovic secures a straightforward hold - Berdych long on the return.

We've also been asking you how you think Andy Murray can improve after last night:

Adrian Ham:, external Sad about Murray. First he needs to get back to 2008-mid 2012 level when he was a whisker off the big three and well clear of rest.

Andrew Neill:, external Murray needs to hire someone like Sampras who not only has the experience he needs but can sort his serve out. It needs it!

Chris Roberts:, external Hire Lendl again. Never been the same since they parted ways.

Dreamy from Djokovic, just dreamy, as he slides along the baseline, trainers screeching, limbs at full stretch, and produces a peach of a crosscourt winner. Berdych in danger once more. 15-30: cue "Jaws" music. Der-dum... Der-dum...

Djokovic sinks his teeth into his opponent from the baseline, forcing the Czech to overcook a forehand. Two break points Djokovic. A botched Berdych backhand and it's all over. Berdych looks at his racquet, but his strings aren't speaking to him at the moment.

Andrew Castle
BBC tennis commentator on BBC Two

"At various times over his career, Djokovic has taken on other people to help work on his game - Todd Martin and Mark Woodforde among them. I'm not sure the Todd Martin episode worked, but Mark Woodforde is a tremendous coach."

Image source, AP

Every point for Berdych must feel like a long, tortuous trek up Kilimanjaro. The 29-year-old Czech nicks one point on the Djokovic serve, but the majority of his returns plonk into the net, allowing the Serb to ease to a hold to 15. Is there a way back from here for Berdych.

Andrew Castle
BBC tennis commentator on BBC Two

"When Djokovic is winning this easily, the only thing he has to guard against is complacency. But with the semi-finals tomorrow, the quicker he can get off court, the better."

Angus in London: I have been watching Andy Murray since he began and never remember anything like last night. His mental resolve shot, nothing to offer in response and huge unforced errors. It's been a tough year though and he will bounce back. Solid fitness and more matches make a huge difference. I'm still undecided if he needs a new coach - wait until after Australia? No coach could have helped him last night!

A promising start for Berdych. An ace down the middle to advance to 30-0... Another easy point... 40-0... the Czech cruising...

But he misfires on the next point, a forehand wide for 40-15, and double faults on the next. Oh my. Danger. Djokovic drags his opponent to deuce. Unforced errors proving to be Berdych's downfall.

Advantage. Deuce. A fruitful start turning into a messy end for Berdych, who slaps an easy forehand into the tape to gift Djokovic a break point.

An ace from Berdych saves the day - or does it? Djokovic challenges and the Serb, who has 20/20 vision is seems, is proved right. Still break point Djokovic... Berdych on the backfoot at the baseline... the Czech's forehand drifts wide. Djokovic bossing it.

Tim Henman
Former British number one on BBC Two

"Berdych has a very good game, but I'd like to see him add more strings to his bow. He needs to try something different against Djokovic - what's he got to lose? It's not like he's going to come third. He's 6ft 5ins, his second serve is 88mph - and he hits it straight up the middle of the court back to Djokovic."

Mikeh:, external Berdych is a bottler. Never win a slam.

John McEnerney:, external ND wants to do what Fed did to AM & he's all about business as usual, super clinical. He's in great form & unstoppable even 4 Fed.

Andrew Castle
BBC tennis commentator on BBC Two

"That's Djokovic definitely through to the semi-finals. We'll be seeing him on Saturday... and most probably Sunday too."

The Djokovic backhand is purring, the world number one making Berdych look as if he has cement in his boots as he drills one into the corner for the first point.

A bit of fortune for Berdych, though, and the big Czech raises his racquet in acknowledgement as a mishit lob drops inside the baseline.

That is as good as it gets for the 29-year-old, though, as Djokovic accumulates two break points, needing just the one - Berdych returning long - to hold to 15.

Andrew Castle
BBC tennis commentator on BBC Two

"Reaching the final of Wimbledon in 2010 was probably Berdych's career highlight. But he lost to Cilic in two of the Grand Slams this year. He's a consistent performer, but how do you turn him into a Grand Slam winner?"

Sanj:, external #ATPFinals really should've been Djokovic v Federer every day. Guy with most wins in week gets the trophy. That would've been fun!

Sue in Northampton: I saw Lendl win this in '85 from my hospital bed - am I right in saying his prize was a diamond studded racket?

Daniel Jellicoe: Quite simply the one thing Murray lacks is a big first serve, something Federer and Djokovic both possess. He needs to win more free points.

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