Murray 6-6 Clement Murray holds serve to force a tiebreak. Clement makes the first line-call challenge of the match when his approach shot after a marathon rally is called long. The hawk-eye replay shows that the ball was indeed well out - Clement probably just fancied a bit of a breather after his exertions.
Murray 5-6 Clement Clement is looking the more solid player at the moment as he polishes off another service game. Murray keeps peering anxiously down at his fingers. Presumably it's a blister rather than a broken nail.