Murray plays down back worries  Andy Murray insists minor
injuries are part and parcel of the game Andy Murray insisted
there is no cause for concern over the state of his back after
grinding out a straight-sets victory over Mikhail Youzhny to
reach the Wimbledon quarter-finals for a sixth straight year.
The second seed clutched at his side a few times during Monday's
6-4 7-6 (7/5) 6-1 win on Centre Court, which was a worrying echo
of the back troubles during the clay-court season that led to
him pulling out of the French Open.  Although the win came in
straight sets, there was not the same fluency about Murray's
game, with the Scot having to fight back from 5-2 down in the
second set and then 5-3 down in the tie-break. He played down
worries over his fitness, though, saying: "There's no cause for
concern. My back is what it is. It's felt way, way better than
it was a few weeks ago."  Murray continued: "There's a few times
on the court where you feel things. You just have to find a way
of managing those issu