"The annual tradition of media-room maths panic has set in early this year as 'qualification scenarios' are tossed round the room. Basically, all four men in Group B can qualify and a straight-sets win for Murray over Federer is likely to be enough. The way Federer is playing, it should come with a guaranteed semi-final place anyway. Get back top us tomorrow and we'll have the complete picture. Maybe."
BBC Sport at the O2 Arena in London