Hello and welcome to LIVE coverage from the second of the ATP World Tour Finals at the O2 Arena. Andy Murray takes on Roger Federer for the right to play Novak Djokovic in tomorrow night’s final

That was emphatic from Federer in the end, after that sluggish start. Brilliant stuff from the world number two who remains on course for a seventh ATP World Tour Finals title. He will face world number one Novak Djokovic in tomorrow night's final

MURRAY 6-7(5) 2-6 - GAME, SET & MATCH! Federer serves out in some style, a forehand that catches the top of the tape from Murray easily sitting up for Fed who races up to the net and drills the forehand down the line to seal the match at the first attempt

MURRAY 6-7(5) 2-5 - BREAK! A sensational backhand passing shot winner from Federer sees him grab the double break - what a set and a half this has been from Fed since that early break - and he will get the chance to serve for the match after the change of ends

MURRAY 6-7(5) 2-4 - Boom! Federer races through a anouthe very speedy service hold, Federer winning eight of nine points in this set when he has played a second serve. Murray is barely getting a look in against serve and that is reflected in the score as Fed creeps closer to the win

MURRAY 6-7(5) 2-3 - Much better from Murray this time around as he goes 40-0 up and this time consolidates that lead by firing an off-forehand winner across court that Fed cannot return over the net

MURRAY 6-7(5) 1-3 - Another absolutely shocking drop shot from Murray smacks of running out of ideas. This one is a sliced forehand drop shot and doesn't clear the net, in fact it struggles to even reach the net. Federer holds to 15 to consolidate the break and it's a long way back for Murray now

MURRAY 6-7(5) 1-2 - BREAK! A poor drop shot attempt from Murray at 40-0, which Federer gets up to easily before going on to find a winner, haunts the Brit as he quickly finds himself staring at a break point after a backhand into the net. AND FEDERER DOES BREAK! Another lengthy rally ends with Murray hitting into the net and the world number two finds himself a set and a break down

MURRAY 6-7(5) 1-1 - A blink-and-you'll-miss-it service hold from Federer sees him quickly level up and sling all the service pressure back over the net at Murray

MURRAY 6-7(5) 1-0 - A frustrated game from Murray but in a harnessed way as he dismissively drills a backhand winner across court and on to the line to seal a hold to 15. That was an important hold for Murray

MURRAY 6-7(5) - SET! Federer takes the first set! A vicious backhand from Federer is quickly followed by a clenched fist as Murray fails to get the ball back in play and the world number two goes a set up

MURRAY 6-6(5-6) - TIE-BREAK! Murray saves the first with a huge forehand across court which Federer, slow to move after his return, cannot get back over the net. The next set point will be on Federer's own serve though ...

MURRAY 6-6(4-6) - TIE-BREAK! Murray waits and waits and waits before throwing his whole body-weight at a forehand down the line only to clatter the ball into the net and hand Federer a two set points

MURRAY 6-6(3-3) - TIE-BREAK! Murray goes a mini-break up with a series of big-serves and a forehand winner. But Federer bounces straight back with an off-forehand winner across court after a 22-shot rally to level up for the change of ends

These two have played five tie-breaks in their previous meetings; Murray won his two in 2008 while Federer won two in 2009 and one in 2010

MURRAY 6-6 - A squash-like flicked backhand from Federer goes for a winner down the line, it's an outrageous shot from the world number two. But Murray bosses the rest of the game and does hold to force the breaker

MURRAY 5-6 - Federer comparatively comfortable on serve again as he holds with an ace to sneak ahead once more. Can Murray force the tie-break? He will serve to stay in this opening set for a second time after the change of ends

MURRAY 5-5 - Federer is all over Murray's second serve now as he batters a return for a winner to take the first point of the game. Murray levels at 15-15 before chucking in a double fault. There's real tension in the arena now. Fed hits long off the backhand wing to allow Murray to level again before a smash winner (albeit at the second attempt) earns him a game point and he goes on to hold when Fed sends a backhand just wide to end a lengthy rally

MURRAY 4-5 - A frustrated return of serve from Murray fizzles across court and on to the line, Fed only returning it wide down the line. But it's the only point Murray manages during the game as Fed holds to 15 to sneak ahead for the first time in this match. Murray will now have to serve to stay into this opening set after the change of ends

MURRAY 4-4 - BREAK! A great first serve from Murray helps him get off the mark from 0-30 down. And he gets a little lucky when Fed hits into the net to allow him to level at 30-30. But a shocking backhand passing shot attempt from Murray that drifts well long hands Fed a break back point. And Fed does take the chance, pulling Murray wide and drawing the error - a forehand into the net

In case you missed it earlier, Novak Djokovic battled back from dropping the first set against Juan Martin Del Potro to reach the final. Read all about it by clicking the link here: