Welcome to LIVE text coverage of Jo-Wilfried Tsonga's World Tour Finals clash with Mardy Fish at the O2 Arena in London.

TSONGA 7-6 6-1 - GAME, SET AND MATCH! Tsonga wraps up victory with a convincing service hold, and the Frenchman is absolutely overjoyed with the victory as he salutes the crowd and basks in the moment! Tsonga wins comfortably after an emphatic second set, and Fish cuts a demoralised figure as he troops off. Tsonga goes to the top of the Group B standings. Thanks for joining us.

TSONGA 7-6 5-1 - BREAK! Tsonga races to 0-40 as Fish falters badly on serve once more and sees his delivery ruthlessly attacked by the Frenchman. Tsonga goes wide with a forehand, but Fish himself plants a very tame forehand wide of the open court, and Tsonga has a chance to serve out for a 6-1 second set now!

TSONGA 7-6 4-1 - Tsonga again consolidates his break of serve with a confident hold, and the Frenchman is striding purposefully towards victory now as he opens up a three-game cushion. Fish has to hold now to give himself a chance of attacking the Tsonga serve.

TSONGA 7-6 3-1 - BREAK! There is no stopping Tsonga in this second set as he roars back once more to break serve for the second time in succession, and Fish is beginning to look very jaded and despondent as the match slips away from him.

TSONGA 7-6 2-1 - Tsonga holds serve, and does so pretty confidently to ensure that he establishes himself in this second set with it on terms. Fish must now show that he can hold serve in this second set, and level at 2-2. The American looks pretty agitated as he prepares to begin the game.

TSONGA 7-6 1-1 - BREAK! Tsonga continues to look almost more comfortable on his opponent's serve than his own, and he reacts to having his serve broken by roaring back to dismantle Fish's delivery! Two huge forehands close out the game.

TSONGA 7-6 0-1 - BREAK! Fish stamps his authority on the second set from the outset as Tsonga wavers on serve and is clinically and ruthlessly punished by his opponent. Tsonga already has work to do in this second set, and he must react swiftly.

TSONGA 7-6 - SET! Tsonga closes out the opening set with a huge serve down the T, and the Frenchman brushes Fish aside in convincing fashion in the breaker to take it 7-4! Fish is furious with himself for losing the breaker so easily, but Tsonga was hugely impressive.

TSONGA 6-6 (5-2) - Tsonga takes control of the opening set tie-break with a fearsome forehand down the line as Fish drops fractionally short, and he opens up a three-point lead.

TSONGA 6-6 - Tsonga holds his composure superbly to fire two big first serves to take control of the game, and he closes it out with a flashing forehand winner cross court to take this opening set into a tie break!

TSONGA 5-6 - Fish has completely turned this opening set around, and the American closes out another very impressive service game with a huge first delivery down the T, and Tsonga suddenly finds himself having to hold serve to stay in the set.

TSONGA 5-5 - BREAK! Fish levels up the opening set at 5-5 with an audacious lob which lands on the line, followed by a flurry of fierce forehand returns which leave Tsonga stunned. It's a brilliant time to break, and suddenly the American is back on terms.

TSONGA 5-4 - Fish reduces the deficit with a solid hold, and Tsonga clearly has his focus on the next game as he looks to serve out for the set. Fish then has a lengthy debate with the umpire over a line call which does not cost him the game, and it's all a bit unnecessary.

TSONGA 5-3 - Tsonga moves to within a game of the opening set with a convincing hold, and the Frenchman is utterly unerring as he slams a forehand cross court to beat Fish's desperate lunge. Tsonga looks very assured, and it will require something special from Fish to stop him winning the set.

TSONGA 4-3 - Fish is very fired up now as he attacks his groundstrokes with relish, and Tsonga is forced back behind the baseline as he takes on more ambitious shots and pays for it with a number of unforced errors.

TSONGA 4-2 - Tsonga hammers a ferocious serve down the T to leave Fish groping desperately at full stretch, and the Frenchman does not let his intensity slip at all as he closes out the game with a flurry of powerful, uncompromising groundstrokes.

TSONGA 3-2 - Fish steadies himself with a much more assured service hold to 15, and Tsonga is unable to get a foothold as he looks to attack his opponent's serve once more. The American is beginning to adjust his shots to the slow court now, and he looks much more settled.

TSONGA 3-1 - Tsonga manages to keep his composure and high intensity on serve this time, and the Frenchman closes out a tight game with a string of belligerent groundstrokes to back up his serve. He's finding a much better rhythm on his first delivery now, and it tells.

TSONGA 2-1 - BREAK! Neither player is looking remotely comfortable on serve, and Tsonga breaks for a second time - the third break in successive games - to restore his advantage in this opening set. Can Tsonga consolidate his break of serve on this occasion?

TSONGA 1-1 - BREAK! Huge credit has to go to Fish, who bludgeons successive forehand winners past the helpless Tsonga to seal an immediate break back! Tsonga falters on serve and is caught in a rather sluggish service game as the American is straight back on terms.