Hello and welcome to our LIVE coverage of the ATP World Tour Finals Group A clash between Jo-Wilfried Tsonga, the seventh seed from France, and fifth seed Tomas Berdych from Czech Republic. The preceding doubles match has gone to a Champions tie-break, so this will likely start at around 8pm.

So what does that mean? Well it means that Djokovic is not guaranted a place in the semis, as if he loses to Berdych it will come down to games won. These round-robins are a touch confusing aren't they? Let me know what you think on Twitter @Reda_Eurosport. Thanks for joining me, I'll be back tomorrow for the Group B matches, with Federer facing Ferrer and Del Potro up against Tipsarevic. Cheers.

TSONGA 5-7 6-3 1-6 - GAME SET AND MATCH BERDYCH! Two breaks up and Berdych can afford to take a few risks, but he leaves the left baseline unguarded as Tsonga passes nicely away. But Berdych opens up a nice, crisp forehand beyond Tsonga's lunge, and a monster serve down the middle is followed by a poor, long backhand by Tsonga and we have two match points. Berdych takes them with a dipping forehand winner to the left, wrapped up in 1h52.

TSONGA 5-7 6-3 1-5 - BREAK! I hope Tsonga hasn't just given up, Berdych is all over him now as a fierce forehand cross lands beyond the Frenchman's stretch. Three break points, on second serve now, and Tsonga rushes to net to slice his backhand wide and leave Berdych serving for the match.

TSONGA 5-7 6-3 1-4 - Tsonga drills a ferocious double-backhand away from Berdych to start his comeback in earnest. The Czech brings out his power serves to edge ahead but his first double fault tonight draws them level at 30-30. And he holds to back up his break - if he wins here it's all open for qualification. Very interesting.

TSONGA 5-7 6-3 1-3 - BREAK! Hello, Berdych now has two break points, and he takes them as Tsonga overhits a forehand cross beyond the right baseline. Deary me, he's put himself in real trouble and it's his own fault!

TSONGA 5-7 6-3 1-2 - Berdych holds in about as much time as it takes to say "Celtic have just beaten Barcelona, having almost beaten them last time". The rest is a footnote I fear.

TSONGA 5-7 6-3 1-1 - Tsonga edges 9-8 ahead in the ACE count and holds to 15 with a cool diagonal forehand off the line.

TSONGA 5-7 6-3 0-1 - Break points Tsonga early in the third and final set but he stumbles to send an overhead long, and a fine serve levels at deuce. He's made to work for it but Berdych finally holds to start the decider. Tsonga looks annoyed with himself, he sensed a real chance.

TSONGA 5-7 6-3 - SET! And a wonderful selection of volleys at the net see Tsonga roar back to set point, one flying backhand and a cool pass. Classic JWT. ACE to hold under serious pressure and force a decider. Suddenly Tsonga shows magnificent form.

TSONGA 5-7 5-3 - Tsonga is suddenly in trouble as he serves for the set, 0-30 down after some poor deliveries are exploited by Berdych, but he's back in it as the Czech returns long. Massive serve to follow, Berd gets something on it but Tsonga adjusts his body to curve a forehand down the line. 30-30. But break point now as Tsonga goes wide! But saved with a majestic second serve ace down the middle! Ballsy from Tsonga!! Deuce.

TSONGA 5-7 5-3 - Good show from Berdych as he quickly turns that service game around, still no double faults in this match as Tsonga leads the winners count 19-10.

TSONGA 5-7 5-2 - Tsonga is holding it together on serve though as he takes the next one to 15 with Berdych netting then going long from deep. Berdych serving to stay in the second.

TSONGA 5-7 4-2 - Big Berd stops the rot with a comfortable hold as he unleashes his power on Tsonga, a big hitter himself, on serve. The Frenchman still a break up.

TSONGA 5-7 4-1 - Lovely volley at the net, and a wicked serve brings up 40-15 for Tsonga, who holds as Berdych slips while returning.

Obviously that Tweet game moments before Berdych was broken, but you get the point. The indoor arena suits his beefy power game.

@joeldf: "Berdych adding coolness under pressure to his powerful groundies." - agreed. He still has minor issues on the big points, but he's matured into a big hitter with benefits.

TSONGA 5-7 3-1 - BREAK! Berdych fails to take the game point off deuce as he again allows Tsonga to make it a moving point, the Frenchman using all the angles before pinging it away. And now he has another break point, taken as Berdych's follow-up lands long. This one's a keeper!

TSONGA 5-7 2-1 - An official review of a Tsonga effort shows it was wide, but he levels and now has two break points as he constructs a running point that suits him far better than Berdych, who angles a backhand across the net but wide. Can he take them? Not at the first time of asking, as a brutal serve is somehow returned but only for Berdych to crack it away down the left. Still one break point, but lost as Tsonga returns long, deuce.

TSONGA 5-7 2-1 - Berdych has a sniff at 0-15 but Tsonga is a touch more composed all of a sudden and shows good variety on his groundstrokes to move 40-15 as the Czech nets a diagonal forehand. But Tsonga mis-hits a backhand to net and shows his frustration. He channels it well enough and holds to 30.

TSONGA 5-7 1-1 - Berych launches some more of his ferocious bullets at Tsonga to hold in quick time. Mimicing the first set this - any error will prove vital.