You'd probably think this is pretty stupid, but IMO it's really important for Roger not to get broken in the match.
I mean... I remember when he didn't got broken during the whole Cincinnati tournament and then in the USO he got broken twice vs Donald Young, despite winning in straight-sets.
In 2 weeks it was a different Roger that match.
But of course, when he won AO2010 he lost the first set vs Andreev
and he played amazing tennis during the 2nd week