But after being 2 - 1 up in sets , things went south for Roger , even squandering a match point with a disappointing slice in the net .
Federer had not lost a set up to this last 16 encounter .
After being 2 - 1 up in sets , things went south for Roger , even squandering a match point with a disappointing slice in the net .
Federer had not lost a set up to this last 16 encounter .