Good evening and welcome to LIVE coverage of this Group B clash between Andy Murray and Milos Raonic on day 3 of the ATP World Tour Finals at the O2 in London.

GAME SET AND MATCH ANDY MURRAY 6-3 7-5! Murray wraps it up, and keeps his World Tour Finals campaign alive. It's a tight, tight game as we go to 15-15, 30-30 and deuce. He has a match point at 40-30 but have the nerves get to him and he pats over a 77mph second serve. It's a second serve again on Murray's second MP but this time Raonic misses and Murray wins the must-win clash.

MURRAY 6-3 6-5 RAONIC. Murray breaks at the perfect moment! And what a point to kick off the game! He sends the crowd into raptures as he follows an unlikely reach on the wide serve with a stunning crosscourt backhand passing shot while sprinting to cover the space he had left open. Ridiculous hands. Raonic misses and Murray senses an opportunity at 30-0 and he soon finds himself with break points at 15-40. He only needs one, as he sees Raonic at the net and puts the ball right on his feet, too low for the tall Canadian to dig out. Murray will serve for the match!

MURRAY 6-3 5-5 RAONIC. Murray passes the test convincingly. He misses narrowly long at 30-0 but otherwise it's plain sailing and it's sealed with an ace. The pressure switches to Raonic at the busines end of the second set.

MURRAY 6-3 4-5 RAONIC. Raonic does really well to get the better of Murray in a long tussle and at 30-0 he has the simplest of put-aways. But he sends it wide! It's another worrying miss but he shakes it off and sends a sliced ace out wide to hold to 15. First real test coming up for Murray, who'll have to serve to stay in the second set.

MURRAY 6-3 4-4 RAONIC. Murray concedes the first point and then finds himself down at 15-30. Raonic again misses a straightforward forehand. That was his undoing in the previous Murray service game. The same thing happens here as Murray recovers to hold to 30.

MURRAY 6-3 3-4 RAONIC. The Raonic first serve has well and truly entered the building, and he's even finding his range on his groundstrokes. A thumping ace seals the love service game and this just got interesting.

MURRAY 6-3 3-3 RAONIC. Danger here for Murray as Raonic is well and truly back in this. A thunderous return signals 0-30 and panic stations. But the Canadian returns a 79mph second serve into the net. Criminal. Murray punishes him and presses on to hold to 30. But he has a different opponent on his hands now.

MURRAY 6-3 2-3 RAONIC. The Canadian moves swiftly to 30-0. Are we seeing a resurgence? He's certainly finding more of those first serves now and he moves to 40-15. More huge first serves but now Murray can deal with them, showing great defence on the back foot to take it to deuce and then to save game point at advantage. The first serves continue to rain down and they're just enough to see Raonic over the line, albeit with the help of the let-chord on his drop-volley at advantage.

MURRAY 6-3 2-2 RAONIC. At the change of ends a man appears on the big screen shielding his ears from the rather loud music. Chase and Status, I believe. Don't blame him. He earns himself a big cheer from his fellow fans. Meanwhile Murray lets his advantage slip right after he earned it, gifting Raonic the game and a way back into the match.

MURRAY 6-3 2-1 RAONIC. Murray berates himself as he misses a straight forward forehand down the line on the opening point. He knows if he can take advantage of some of these openings now, he'll have an unshakable grip on this match. Any opening looks to have disappeared at 40-0 but Murray pulls it back to deuce, thanks to a deep backhand and an unforgivable Raonic forehand miss. Another wild miss from the Canadian brings up break point and a crosscourt return to the backhand wing sees Murray seal the break. Five points in a row he won there.

MURRAY 6-3 1-1 RAONIC. Outstanding hands from Murray to set up and put away a backhand volley, and he then shows something from the Raonic textbook - a big fat ace. He goes on to hold comfortably.

MURRAY 6-3 0-1 RAONIC. Murray means business here and soon finds himself at 30-0 and sensing more blood. But Raonic is reacquainted with his trademark monster serve and he's well on his way to 40-30. It's a second serve on game point, but it's a fierce one, and he puts away a smash to complete the hold.

This a completely different Andy Murray to the one we saw go down meekly against Kei Nishikori. He's found his stride, looks hungry for it, and looks a class above his opponent whose main weapon has gone missing.

MURRAY 6-3 RAONIC. Murray clinches the opening set! He races to 30-0 but comes to the net and sees an outstanding crosscourt forehand fly past him. A further forehand winner signals more Raonic resistance and Murray misses to make it deuce. But he makes no mistake from there, two big serves doing the damage.

MURRAY 5-3 RAONIC. Raonic holds his serve but Murray threw it away really. Raonic gets the better of Murray after a long exchange at 30-15, finishing the point with an inside out forehand winner. But limp Murray errors see us at 5-3. Maybe he's got one eye on coming out and serving for the set.

MURRAY 5-2 RAONIC. Murray lets out a big "come on!" as he wins the first point, then again as he brings up 40-0. He nets a dropshot but Raonic spanks a forehand long and there's a third "come on" as he jogs to the chair. He looks fired up, animated, and knows he's taken command of this match.

MURRAY 4-2 RAONIC. A double fault kicks off this game as the Raonic first serve continues to falter - hovering around the 33% mark. Murray needs to take advantage - he won't get this luxury all evening. He's wasteful on two occasions but brings up 30-40 and break point, and goes after the serve, forcing the Canadian to miss long. First blood to Murray!

MURRAY 3-2 RAONIC. Murray strikes a delightfully arced crosscourt forehand winner on the run on his way to 40-15. He then pushes a sliced backhand right inside the baseline and Raonic is unable to dig it out. Brilliant stuff from the world number 5, who's really finding his groove now.

MURRAY 2-2 RAONIC. Enouraging signs here for Murray when he gets a look at a second serve. When he can extend the rallies, he is clearly the stronger of the two and despite seeing an ace flash past him, he finds himself with break points at 15-40. He can't convert either, though, and from deuce Raonic rediscovers his first serve to ride the storm and see out the game.

MURRAY 2-1 RAONIC. Murray nets a sloppy backhand and Raonic pushes a forehand volley right into the corner to bring up 15-30 and apply some pressure. Murray, though, keeps his cool and gets to 40-30, where the dropshot is again used to good effect, Raonic missing long to make it 2-1.